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

[DiscreteTom]

Summary

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

Moved from #13171 due to the branch is renamed to fit the naming scheme.

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]

[tysoekong]

Here @DiscreteTom is the updated SDK: Kong/lua-resty-aws#119

If you use this newer version of the SDK, you should receive an extra table param back from the AWS execute function body_reader which comes from the res object.

You can use this to read each chunk back to the client. Decode of the chunk is still manual, because it is a bit more rework to turn execute_request into a weird optional iterator.

Does this work for your Lambda plugin enhancement so far?

[bnusunny]

Any update on this PR?

[gustoliv]

It would be great to have this merged. Currently, we dont have a way to invoke a Lambda function using the response streaming model, and with the increasing adoption of GenAI and chat models, having this capability without needing to create additional components, such as exposing Lambda through the AWS API Gateway, would be incredibly helpful.