[feat] Add AWS Bedrock rerank

[warren830]

Summary

This pr adds AWS Bedrock rerank.

Tip

Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

Screenshots

we can choose rerank model:

And here we can successfully retrieve documents:

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

cc @Yeuoly @laipz8200

[warren830]

@crazywoola sorry, can you approve again

[crazywoola]

Still failed to pass the lint.

[warren830]

Sorry man@crazywoola , this time I used ruff to make sure: