feat: add Bedrock reasoning support

[adesinah]

Description

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

Closes point 3 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 introduces document reranking support via Cohere Rerank models and adds support for Bedrock reasoning ('thinking') content, enabling features like Claude's extended thinking. It also integrates request timeouts across various model invocations and adds comprehensive live and unit tests. A critical issue was identified in the live tests where an uninitialized Bedrock instance is used to define a model, which would result in a panic; reusing the initialized plugin instance is recommended.

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[xavidop]

can you fix the linting issues in this pr too?

[adesinah]

can you fix the linting issues in this pr too?

yes, i notice that too. It will be fixed in this PR. Thanks!

[adesinah]

@xavidop it's good for a review when you get a chance. thank you!

[github-actions]

🎉 This PR is included in version 1.16.0 🎉

The release is available on GitHub release

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