[RFC 10008] Roadmap for HTTP QUERY support in Cache API

[Utsav7428]

I am currently working on implementing HTTP QUERY support (RFC 10008) for the Cache API to enable more efficient search-like semantics.
I have submitted a Draft PR (#6857 ) covering Phase 1 & 2 of the implementation:

API boundary validation and method routing.

Request sizing and telemetry span updates.

The PR is fully tested and ready for architectural review.

I am now moving toward Phase 3: Body Stream Pumping.

I would appreciate any guidance from the maintainers on the preferred architectural pattern for this bridge to ensure it aligns with the workerd event-loop and memory safety model.

Reference PR: #6857