feat(worker): deliverer proxy

[vm-001]

Summary

This PR added proxy support for the deliverer client. HTTP, HTTPS, and mTLS proxies are supported,

[codecov]

Codecov Report

❌ Patch coverage is 87.67123% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
worker/deliverer/http.go	80.85%	5 Missing and 4 partials ⚠️

Flag	Coverage Δ
integration	78.85% <79.45%> (+0.36%)	⬆️
unit	13.48% <19.17%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	84.37% <100.00%> (+1.94%)	⬆️
config/worker.go	100.00% <100.00%> (ø)
worker/deliverer/deliverer.go	100.00% <ø> (ø)
worker/deliverer/http.go	82.56% <80.85%> (-2.28%)	⬇️

... and 2 files with indirect coverage changes

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