Add DSPy integration to logfire

[bdsaglam]

Motivation

• Provide first-class instrumentation support for the DSPy library via OpenInference to match existing integrations like LiteLLM.
• Allow users to call logfire.instrument_dspy() to auto-instrument DSPy calls and capture LLM activity in Logfire.
• Expose a documented, discoverable integration in the docs and navigation so users can find and install the optional extra.

Description

• Added a new integration wrapper logfire/_internal/integrations/dspy.py which loads openinference.instrumentation.dspy and calls DSPyInstrumentor().instrument() with the Logfire tracer provider.
• Added a public API method instrument_dspy on Logfire (logfire/_internal/main.py) and exposed it on the module surface (logfire/__init__.py).
• Added documentation page docs/integrations/llms/dspy.md and added it to mkdocs.yml navigation.
• Added the dspy optional dependency extra in pyproject.toml referencing openinference-instrumentation-dspy.

Also tested manually with a simple ReAct agent implemented here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[alexmojaki]

please skip tests for old pydantic

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Pull request overview

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[alexmojaki]

Thanks!