feat(plugin): plugin ordering

[vm-001]

Summary

The plugin execution order determines whether the application works as expected.

This PR introduced the (Plugin) Iterator so that plugins can be executed in the expected order.

[codecov]

Codecov Report

❌ Patch coverage is 84.68468% with 17 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
app/app.go	70.96%	5 Missing and 4 partials ⚠️
plugins/iterator.go	92.59%	2 Missing and 2 partials ⚠️
pkg/plugin/base.go	0.00%	2 Missing ⚠️
proxy/gateway.go	75.00%	1 Missing ⚠️
worker/worker.go	75.00%	1 Missing ⚠️

Flag	Coverage Δ
integration	75.39% <84.68%> (+0.69%)	⬆️
integration-o11	39.26% <39.63%> (-0.07%)	⬇️
unit	11.74% <0.00%> (-0.11%)	⬇️

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

Files with missing lines	Coverage Δ
constants/cache_key.go	100.00% <ø> (ø)
pkg/plugin/plugin.go	60.00% <ø> (ø)
plugins/basic-auth/plugin.go	100.00% <100.00%> (+18.18%)	⬆️
plugins/connect-auth/plugin.go	86.66% <100.00%> (+8.09%)	⬆️
plugins/function/plugin.go	92.00% <100.00%> (+9.39%)	⬆️
plugins/hmac-auth/plugin.go	100.00% <100.00%> (+12.50%)	⬆️
plugins/jsonschema_validator/plugin.go	75.55% <100.00%> (+5.78%)	⬆️
plugins/key-auth/plugin.go	100.00% <100.00%> (+8.00%)	⬆️
plugins/wasm/plugin.go	73.68% <100.00%> (+7.01%)	⬆️
plugins/webhookx_signature/plugin.go	100.00% <100.00%> (+9.09%)	⬆️
... and 5 more

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