This PR adds an implementation of a ReWOO agent.

- A ReWOO agent works as follows:

  1. The `planner` node generates the entire chain of tools ("plan") in one go.
  2. The `executor` node processes the "plan" by iterating through each step and invoking the specified tools. Each tool’s output replaces the corresponding placeholder in the plan, and that updated plan is passed to the subsequent tool.
  3. The `solver` node generates the final results based on the complete "plan" and the tool outputs from the previous steps.

- Compared to the ReAct agent, the ReWOO pattern eliminates the need to include the system prompt and all previous steps for every reasoning iteration, thereby reducing token usage and boosting performance.

- This PR also introduces a minor refactor to the `BaseAgent` interface to accommodate the ReWOO pattern, which utilizes three nodes instead of the two nodes used by ReAct.

Closes https://jirasw.nvidia.com/browse/AIQ-849

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AgentIQ/blob/develop/docs/source/advanced/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: NVIDIA#75
Signed-off-by: Eric Evans <194135482+ericevans-nv@users.noreply.github.com>

This PR adds an implementation of a ReWOO agent.

- A ReWOO agent works as follows:

  1. The `planner` node generates the entire chain of tools ("plan") in one go.
  2. The `executor` node processes the "plan" by iterating through each step and invoking the specified tools. Each tool’s output replaces the corresponding placeholder in the plan, and that updated plan is passed to the subsequent tool.
  3. The `solver` node generates the final results based on the complete "plan" and the tool outputs from the previous steps.

- Compared to the ReAct agent, the ReWOO pattern eliminates the need to include the system prompt and all previous steps for every reasoning iteration, thereby reducing token usage and boosting performance.

- This PR also introduces a minor refactor to the `BaseAgent` interface to accommodate the ReWOO pattern, which utilizes three nodes instead of the two nodes used by ReAct.

Closes https://jirasw.nvidia.com/browse/AIQ-849

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AgentIQ/blob/develop/docs/source/advanced/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: NVIDIA#75
Signed-off-by: Eric Evans <194135482+ericevans-nv@users.noreply.github.com>

This PR adds an implementation of a ReWOO agent.

- A ReWOO agent works as follows:

  1. The `planner` node generates the entire chain of tools ("plan") in one go.
  2. The `executor` node processes the "plan" by iterating through each step and invoking the specified tools. Each tool’s output replaces the corresponding placeholder in the plan, and that updated plan is passed to the subsequent tool.
  3. The `solver` node generates the final results based on the complete "plan" and the tool outputs from the previous steps.

- Compared to the ReAct agent, the ReWOO pattern eliminates the need to include the system prompt and all previous steps for every reasoning iteration, thereby reducing token usage and boosting performance.

- This PR also introduces a minor refactor to the `BaseAgent` interface to accommodate the ReWOO pattern, which utilizes three nodes instead of the two nodes used by ReAct.

Closes https://jirasw.nvidia.com/browse/AIQ-849

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AgentIQ/blob/develop/docs/source/advanced/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: NVIDIA#75
Signed-off-by: Yuchen Zhang <134643420+yczhang-nv@users.noreply.github.com>

This PR adds an implementation of a ReWOO agent.

- A ReWOO agent works as follows:

  1. The `planner` node generates the entire chain of tools ("plan") in one go.
  2. The `executor` node processes the "plan" by iterating through each step and invoking the specified tools. Each tool’s output replaces the corresponding placeholder in the plan, and that updated plan is passed to the subsequent tool.
  3. The `solver` node generates the final results based on the complete "plan" and the tool outputs from the previous steps.

- Compared to the ReAct agent, the ReWOO pattern eliminates the need to include the system prompt and all previous steps for every reasoning iteration, thereby reducing token usage and boosting performance.

- This PR also introduces a minor refactor to the `BaseAgent` interface to accommodate the ReWOO pattern, which utilizes three nodes instead of the two nodes used by ReAct.


Closes https://jirasw.nvidia.com/browse/AIQ-849

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AgentIQ/blob/develop/docs/source/advanced/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: NVIDIA#75

This PR adds an implementation of a ReWOO agent.

- A ReWOO agent works as follows:

  1. The `planner` node generates the entire chain of tools ("plan") in one go.
  2. The `executor` node processes the "plan" by iterating through each step and invoking the specified tools. Each tool’s output replaces the corresponding placeholder in the plan, and that updated plan is passed to the subsequent tool.
  3. The `solver` node generates the final results based on the complete "plan" and the tool outputs from the previous steps.

- Compared to the ReAct agent, the ReWOO pattern eliminates the need to include the system prompt and all previous steps for every reasoning iteration, thereby reducing token usage and boosting performance.

- This PR also introduces a minor refactor to the `BaseAgent` interface to accommodate the ReWOO pattern, which utilizes three nodes instead of the two nodes used by ReAct.


Closes https://jirasw.nvidia.com/browse/AIQ-849

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/AgentIQ/blob/develop/docs/source/advanced/contributing.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
  - Any contribution which contains commits that are not Signed-Off will not be accepted.
- When the PR is ready for review, new or existing tests cover these changes.
- When the PR is ready for review, the documentation is up to date with these changes.

Authors:
  - Yuchen Zhang (https://github.com/yczhang-nv)

Approvers:
  - Michael Demoret (https://github.com/mdemoret-nv)

URL: NVIDIA#75