fix(aws-lambda): aws lambda service cache by service related fields

[windmgc]

Summary

Cache the aws lambda service by composing a cache key using the service related fields, so that service object can be reused between plugins and vault refresh can take effect when key/secret is rotated

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
• [na] There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

Full changelog

• aws lambda service cache by service related fields

Issue reference

Fix KAG-2832

[team-gateway-bot]

The backport to release/3.5.x failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release/3.5.x release/3.5.x
# Navigate to the new working tree
cd .worktrees/backport-release/3.5.x
# Create a new branch
git switch --create backport-11805-to-release/3.5.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 8b0a8381ecf07732f8788cc14c7743a6e8bc5dd7
# Push it to GitHub
git push --set-upstream origin backport-11805-to-release/3.5.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release/3.5.x

Then, create a pull request where the base branch is release/3.5.x and the compare/head branch is backport-11805-to-release/3.5.x.