OpenApi specification v3.0.0 support

[icnocop]

Hi.

Thank you for Swagger-Net.

If an API endpoint returns a different media type depending on the HTTP status code response, the generated swagger.json emits multiple "produces" elements and the ui only has one "Response content type" drop down list.

I expected the generated swagger.json to indicate the response media type for each HTTP status code response separately.
I expected the ui to have a drop down list for each HTTP status code response.

SwaggerNetExamples.zip

In this case, I expected the HTTP status code 200 response to only have "plain/text" and the HTTP status code 403 response to only have "problem/application+json".

I believe this requires generating the OpenApi specification schema to OpenApi 3.

Thank you.

[sNakiex]

I would also like to see support for OpenApi 3.