docs: Add Groq API integration to models tutorial notebook

[Syeed-MD-Talha]

Summary

Adds documentation and working examples for integrating Groq API with AutoGen using the OpenAI-compatible endpoint.

Changes

• Added new "Groq (experimental)" section to models tutorial notebook
• Includes tested code examples for both direct model usage and AgentChat integration
• Follows existing documentation patterns for OpenAI-compatible APIs
• Added feature compatibility list similar to other providers

Testing

• All code cells execute successfully
• Tested with actual Groq API key
• Verified examples work with different Groq models (llama3-8b-8192, mixtral-8x7b-32768)
• Follows notebook formatting conventions

Additional Context

Groq provides ultra-fast inference speeds which can significantly improve AutoGen agent response times. This addition allows users to leverage Groq's performance benefits in their AutoGen applications.

Addresses the gap in documentation for Groq API integration, which many users have been asking about in community discussions.

Checklist

• I have tested the code examples
• I have followed the existing documentation style
• I have cleared sensitive outputs from notebook cells
• I am willing to sign the CLA if required

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