v2.0.9

Enable GenAI message content capture by default (#195)

## Summary

- Enable message content capture by default for OpenAI, Anthropic,
Google, and Bedrock tracing
- Preserve opt-out support through
OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT=false or
captureContent: false
- Update tracing documentation and examples, with test coverage for
default and explicit settings

## Testing

- npm test
- npm run lint
- npm run build

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Co-authored-by: Vlad Vasilenko <36810938+T3XRD@users.noreply.github.com>
Co-authored-by: Cursor <cursoragent@cursor.com>