Explore moving Tensorboard support from Python extension to its own #14472
Description
### Tasks
- [x] Migrate commands, setting and key binding to ext
- [ ] API requirements https://github.com/microsoft/vscode-python/issues/22174
- [x] How do we migrate the commands?
- [x] Migrate logDirectory setting or leave it under python? (Python ext will not have to care aboud this)