feat: flag to allow converting from yaml to json pre validation

[reversearrow]

libopenapi passes map[interface{}]interface{} structures for deeply nested objects or complex mappings in the OpenAPI specification, which are not allowed in JSON. These structures cannot be properly converted to JSON by libopenapi and cannot be validated by jsonschema, resulting in ambiguous errors.

This flag allows pre-converting from YAML to JSON to bypass this limitation of the libopenapi.

This is a workaround to bypass this limitation at the moment.

[reversearrow]

@daveshanley When you a time to review. It's a temporary workaround of this issue when testing with the script.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.07%. Comparing base (bde0446) to head (d179b28).

Files with missing lines	Patch %	Lines
cmd/validate/main.go	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   97.41%   97.07%   -0.35%     
==========================================
  Files          45       45              
  Lines        3987     4001      +14     
==========================================
  Hits         3884     3884              
- Misses        103      117      +14     

Flag	Coverage Δ
unittests	97.07% <0.00%> (-0.35%)	⬇️

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