feat: add max_tokens option to LLM and LLMStream classes

[dorlanpabon]

This pull request introduces a new max_tokens parameter to the LLMOptions and related methods in the livekit-plugins-openai plugin. The changes ensure that the max_tokens parameter is properly integrated and used throughout the class methods.

Key changes include:

• livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/llm.py:
  • Added max_tokens parameter to the LLMOptions class.
  • Updated the __init__ method to accept and initialize the max_tokens parameter. [1] [2]
  • Modified the with_groq method to include the max_tokens parameter. [1] [2]
  • Included the max_tokens parameter in the _run method to ensure it is passed correctly during execution.

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Latest commit: 53663cf

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