Add support for proto3 optional fields in protoc-gen-openapi #35
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This PR addresses Issue #28 (#28))
which highlights a lack of support for optional fields in proto3 syntax.
The issue is that proto3 optional fields are not supported. The fix adds detection of proto3 optional fields using the Proto3Optional field descriptor property and ensures they are not marked as required in the OpenAPI schema, which correctly reflects their optional nature.
Changes in MakeFile - Added a test proto file with proto3 optional fields to the protoc command to ensure the plugin can handle proto3 optional fields during testing and development