feat(http): add custom handlers for 404 and 405 responses

[jkaninda]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 86.44068% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
okapi.go	89.58%	4 Missing and 1 partial ⚠️
middlewares.go	40.00%	2 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
errors.go	7.47% <ø> (+7.47%)	⬆️
group.go	84.84% <100.00%> (+2.02%)	⬆️
openapi.go	64.75% <100.00%> (ø)
middlewares.go	32.70% <40.00%> (-0.20%)	⬇️
okapi.go	65.33% <89.58%> (+23.33%)	⬆️

... and 3 files with indirect coverage changes

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