feat: Add AppWorker#enqueue_delayed

[spencewenski]

Allow enqueuing delayed sidekiq jobs via the AppWorker trait.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 39.99%. Comparing base (d0dac4a) to head (4a509cf).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/service/worker/sidekiq/app_worker.rs	0.00%	4 Missing ⚠️

Files with missing lines	Coverage Δ
src/service/worker/sidekiq/app_worker.rs	80.30% <0.00%> (-6.80%)	⬇️

... and 37 files with indirect coverage changes

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