feat(bedrock): async client support via asyncio.to_thread

[duf59]

Description

This PR improves the async support for AWS Bedrock clients in Instructor.

• Uses asyncio.to_thread to wrap the synchronous boto3 Bedrock client, enabling non-blocking async usage.
• Updates the docstring for clarity.
• Adds documentation and a self-contained async example in the Bedrock integration guide.

Changes

• Refactored async_wrapper to use asyncio.to_thread
• Improved docstring for from_bedrock
• Added async usage documentation in docs/integrations/bedrock.md

Testing

• Manual review of async and sync usage
• Linting and formatting pass

This PR was written by Cursor

---

Important

Adds async support for AWS Bedrock clients using asyncio.to_thread and updates documentation with async examples.

• Async Support:
  • Uses asyncio.to_thread in from_bedrock() in client_bedrock.py to enable async usage of AWS Bedrock clients.
  • Adds async_wrapper function to handle async operations.
• Documentation:
  • Adds async usage example in docs/integrations/bedrock.md.
  • Updates docstring for from_bedrock() to clarify async behavior.
• Testing:
  • Manual review of async and sync usage.
  • Linting and formatting pass.

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1. docs/integrations/bedrock.md:56

• Draft comment:
  Great async example! Consider adding a brief note about potential thread-pool overhead or thread-safety limitations when wrapping blocking calls with asyncio.to_thread.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

2. instructor/client_bedrock.py:85

• Draft comment:
  Using asyncio.to_thread to wrap client.converse is clear. Consider adding error handling (e.g., try/except) to capture exceptions from the threaded call for better debugging.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 85% None

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