[Epic:.NET] Update generated code to fully comply with Clean Architecture

[overbit]

Currently, the generated code is not fully structured to follow the separations of clean architecture.

This issue is to refactor the file locations and potentially introduce the Result pattern to the generated code to improve DevEx.
An example of result pattern implementation, with implicit conversions, can be found here
https://gist.github.com/overbit/fb74ce2e14e6f46c0470806e41fdd507

Clean Architecture folder structure example can be found here:
https://devblogs.microsoft.com/ise/next-level-clean-architecture-boilerplate/