Generating REST Clients for .NET Minimal / Web API APIs.

### Is your feature request related to a problem? Please describe.

Investigate how retrofit or refit can be used for REST Client generations with dotnet-api tooling.

### Describe the solution you'd like

Retrofit or refit are great libraries for generating REST clients for mostly android apps. They allow you to define an interface containing a set of endpoints that your application will be interacting with, and then you can generate the implementation code. We would like to investigate the possibility of using retrofit/refit/or something new for generating REST Client implementations with dotnet-api tooling.

### Additional context

- [ ] https://github.com/reactiveui/refit
- [ ] https://square.github.io/retrofit/