feat: add openapi yaml response endpoint(/openapi.yaml)

[jkaninda]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
doc.go	0.00%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
doc.go	62.50% <0.00%> (-14.43%)	⬇️

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