Add optional dependencies

[medaminezghal]

Those optional dependencies comes from those files in this folder:
1- MCP
2- OpenAI agents
3- PydanticAI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[medaminezghal]

If openai-agents<0.09 the tests will fails

[alexmojaki]

There's no need for this. pip install logfire[fastapi] is useful because it installs opentelemetry-instrumentation-fastapi which is required for instrument_fastapi to work. It doesn't also install fastapi because it's implied that the user has that or they wouldn't need to call instrument_fastapi. We don't need to tell a user to pip install mcp or logfire[mcp] to use instrument_mcp, it's redundant.

The versions don't need to be regularly updated in pyproject.toml, uv.lock takes care of that.