feat(*): add plugins

[vm-001]

Summary

This PR added inbound plugins basic-auth, key-auth, and hmac-auth.

To support more types in the feature (currently only HTTP), this PR includes a refactor of the Source object, that move fields path, methods, and response into config.http.

#226

[codecov]

Codecov Report

❌ Patch coverage is 89.24731% with 10 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
plugins/hmac-auth/plugin.go	81.81%	5 Missing and 1 partial ⚠️
plugins/basic-auth/plugin.go	81.81%	2 Missing ⚠️
plugins/key-auth/plugin.go	92.00%	2 Missing ⚠️

Flag	Coverage Δ
integration	73.57% <86.02%> (+0.15%)	⬆️
integration-o11	43.02% <7.52%> (-0.68%)	⬇️
unit	12.94% <2.15%> (-0.17%)	⬇️

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

Files with missing lines	Coverage Δ
admin/api/sources.go	87.50% <100.00%> (+0.83%)	⬆️
db/entities/source.go	60.00% <100.00%> (-40.00%)	⬇️
plugins/plugins.go	100.00% <100.00%> (ø)
proxy/gateway.go	77.39% <100.00%> (ø)
utils/validate.go	66.23% <100.00%> (+0.44%)	⬆️
plugins/basic-auth/plugin.go	81.81% <81.81%> (ø)
plugins/key-auth/plugin.go	92.00% <92.00%> (ø)
plugins/hmac-auth/plugin.go	81.81% <81.81%> (ø)

... and 3 files with indirect coverage changes

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