feat(hook): Deliver events to integrations

[prathshenoy]

Summary

What:

• Consume lifecycle events from a durable queue and hand each one to the integrations it resolves to, running them concurrently and retrying then dead-lettering the ones that keep failing.
• Record every dead-lettered event with its full payload and failure reason, and count it on a metric meant to page.

Why:

• Keep a slow or broken integration from stalling or failing the work that triggered it.
• Make a lost notification recoverable and impossible to miss, since nothing else in the system notices when one goes missing.

Test Plan

• Add unit tests.

Revert Plan

• Revert this PR. No service constructs the controller or subscribes to the hook topic.

Issues

• CODEM-416

[behinddwalls]

🛑 Automatic stack rebase aborted — diff mismatch

The rebase of prath.shenoy/hook-dispatch completed without conflicts, but the resulting code diff does not match the original. This means the rebase silently altered code content. The branch was not force-pushed.

Please rebase manually and verify the changes are correct.

Stale