feat(rerank): add Bedrock reranking support

[adesinah]

Description

This MR adds Bedrock reranking support. This PR requires #140 to be merged first.

Closes point 2 in #136

Type of Change

• New feature (non-breaking change which adds functionality)
• Documentation update

Testing

Please describe the tests that you ran to verify your changes:

• Unit tests pass (go test ./...)
• Integration tests pass
• Manual testing performed
• Examples still work

Test Configuration

• Go version:
• AWS Bedrock models tested:
• Operating system:

Code Quality

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have added tests that prove my fix is effective or that my feature works

Documentation

• Updated README.md if needed
• Updated code comments
• Added examples if introducing new features
• Updated API documentation

AWS Bedrock Specific

If this change affects AWS Bedrock functionality:

• Tested with multiple Bedrock models
• Verified AWS credential handling
• Checked error handling for AWS API calls
• Validated streaming functionality (if applicable)
• Tested tool calling features (if applicable)

Checklist

• I have read the CONTRIBUTING.md document
• I have signed the CLA (if required)
• My commits follow the conventional commit format
• I have updated the version number (if applicable)

[gemini-code-assist]

Code Review

This pull request refactors the Bedrock plugin into a more modular structure by splitting logic into separate files and introduces a new Rerank helper for document reranking, accompanied by updated documentation and tests. The review feedback suggests using defer for mutex unlocking in the Init method to improve safety and points out that the RequestTimeout configuration field is currently unused and needs to be integrated into API calls.

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[xavidop]

we should merge this one first or point this one to the previous one

[adesinah]

we should merge this one first or point this one to the previous one

Absolutely, I mentioned that in the PR's description - I had an issue with Merge access, but it was just resolved now. I will resolve the conflict in the PR shortly

[xavidop]

@adesinah thank you!

[xavidop]

looks awesome!

[github-actions]

🎉 This PR is included in version 1.15.0 🎉

The release is available on GitHub release

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