Include logfire with pydantic-ai package

[Kludex]

No description provided.

[hyperlint-ai]

PR Change Summary

Added Logfire as a core dependency in Pydantic AI, simplifying installation and usage instructions.

• Logfire is now included as a core dependency in the pydantic-ai package.
• Updated installation instructions to reflect the inclusion of Logfire.
• Clarified that the Logfire Python SDK is included with pydantic-ai.

Modified Files

• docs/install.md
• docs/logfire.md

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