Review existing Swagger / OpenAPI support

[JasonTypesCodes]

While researching #199 I stumbled on some outdated Swagger annotations that need to be fixed. After some investigation into that, I'm not confident that our Swagger/OpenAPI functionality is behaving correctly. I had to make a number of configuration updates to a test application to retrieve the OpenAPI yaml, and it looked like the file that was produced only contained test endpoints. I haven't had time to investigate further, but I would like to review the support in the upstream generator out of the box and validate that we are providing similar functionality here.