What does this PR do ?

Enable the following, simpler, usage pattern for inference:

answer = model.generate(
    prompts=[
        [
             {
                  "role": "user", 
                  "content": f"Transcribe the following: {model.audio_locator_tag}", 
                  "audio": [audio_path]
             }
        ],
    ],
    max_new_tokens=64,
)

Collection: speechlm2

Changelog

• supported audio key in prompts list (can be a string or a list if multiple audio locator tags are used)
• can specify generation_kwargs to be passed directly to model.llm.generate used under the hood.
• when generation_config is not specified, we'll auto-create one, pre-populating BOS, EOS, and PAD token ids.

Usage

• You can potentially add a usage example below

# Add a code snippet demonstrating how to use this 

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• Bugfix
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Additional Information

• Related to # (issue)