feat(plugins/aws-lambda): support Lambda response streaming

[DiscreteTom]

Summary

Make the aws-lambda plugin to support Lambda response streaming.

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 #[issue number]

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[ttyS0e]

Hey gateway team, I've told the contributor in linked issue that I will create PR to get these SDK files into lua-resty-aws, because I also have similar stuff open for AI and Bedrock.

I am working on it right now!