feat(balancer): refresh uri and tls scheme in ai-proxy-advanced balancer phase

[oowl]

Summary

1. feat(patch): backport balancer.set_upstream_tls feature from openresty upstream feature: add balancer.set_upstream_tls(on). openresty/lua-resty-core#460
2. feat(patch): refresh upstream uri variable when proxy pass balancer recreate
3. feat(pdk): dynamic control upstream tls when kong.service.request.set_scheme was called
4. feat(llm): recreate http request header and body when balancer retry

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

AG-183