Summary

This PR attempts to fix issue #14309 by properly handling URL encoding in AWS SigV4 authentication. Specifically:

• Escapes the path before setting the request.
• Unescapes the path when computing the SigV4 signature.

I still need to test this end-to-end with an AWS Bedrock inference profile.

Please let me know if this approach is acceptable. If not, feel free to close this PR.

Checklist

• The Pull Request has tests
• A changelog file has been created under changelog/unreleased/kong or skip-changelog label added on PR if changelog is unnecessary. README.md
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Issue reference

Fix #14309