Mlflow tracing and evals

[mjschock]

Integrates MLflow for tracing OpenAI calls and evaluating GenAI responses in both Python and TypeScript examples.

This integration enables automatic tracing of OpenAI calls in the Python A2A server and custom tracing via a lightweight MLflow REST client in the TypeScript A2A server. For evaluations, the Python test client uses MLflow's GenAI relevance metric, while the TypeScript client logs custom metrics like prompt overlap, providing comprehensive observability for agent interactions.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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