feat(stovepipe): add request history protobuf contract - #638

Summary

Intent:

• Expose a stable, queue-scoped contract for reading complete retained request history.
• Match SubmitQueue public response shapes while keeping internal persistence modeled as a request log.

Changes:

• Return ordered HistoryEvent values directly from request-ID lookup.
• Return repeated RequestHistory values from URI lookup; each contains only request_id and ordered events.
• Leave URI, build strategy, and base URI on the independently resolvable Request.
• Leave validation degree in internal metadata; the initial proto has no ValidationResult projection.
• Regenerate the gRPC and YARPC bindings from the aligned contract.

This PR builds directly on #634.

Test Plan

• ./tool/bazel test //api/stovepipe/... //service/stovepipe/... //stovepipe/...
• make lint
• make check-tidy
• make check-gazelle

Revert Plan

Revert this PR; the request-history RFC remains independently reviewable in #634.

Jira Issues

None.