Update logfire.instrument_pydantic_ai() parameters

[alexmojaki]

This way our docs and signatures can reflect the latest parameters while remaining backward and forward compatible.

[Copilot]

Pull Request Overview

Updates the logfire.instrument_pydantic_ai() function to include additional parameters for better control over Pydantic AI instrumentation while maintaining backward and forward compatibility.

• Added new parameters: include_content, version, and made event_mode optional
• Reordered parameter definitions and improved documentation with detailed explanations
• Enhanced parameter handling using introspection to support different Pydantic AI versions

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
logfire/_internal/main.py	Updated function signatures and documentation for the new parameters
logfire/_internal/integrations/pydantic_ai.py	Refactored parameter handling with introspection-based compatibility
tests/otel_integrations/test_pydantic_ai.py	Added comprehensive test for all new parameters

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