[Feature]: Martian (model router) support

[areibman]

💡 Feature Description and Proposed Solution

Add support for Martian for the OpenAI client

https://docs.withmartian.com/martian-model-router/getting-started/quickstart-integrating-martian-into-your-codebase/openai-python

To instrument, add the extra metadata to the LLM Event. We can detect this when the OpenAI endpoint points to Martian

🤔 Related Problem

No response

🤝 Contribution

• [ ] Yes, I'd be happy to submit a pull request with these changes.
• [ ] I need some guidance on how to contribute.
• [ ] I'd prefer the AgentOps team to handle this update.