Add Project Template for an API application with minimal dependencies

[eerhardt]

Related to #32485

We should have a template that produces an API application, but is very bare-bones, can be published using PublishAot=true with no warnings, and produces a minimally sized executable.

This template would:

• Take advantage of the API proposed in Allow minimal host to be created without default HostBuilder behavior #32485
• Have an endpoint that returns an application/json response using JSON source generation
• Have TrimMode=full by default
• Optionally have PublishAot=true|false
• Configure any source generators needed for trim/AOT safety.
  • Generate route handler-endpoints at compile time via source generator #45524

cc @DamianEdwards

[DamianEdwards]

More strawman details. These will likely evolve during .NET 8:

> dotnet new api -aot

• Has a template option --publish-aot with alias -aot that writes the property <PublishAOT>true</PublishAOT> to the .csproj file
• Has no template option to control use of HTTPS and does not have HTTPS configured (in code or launchSettings.json launch profiles)
• Is configured to use workstation GC via property <ServerGarbageCollection>false</ServerGarbageCollection> in the .csproj file
• Does not have appsettings.json file (the empty/slim host does not have the settings files config provider added)
• Has single MapGet call that declares a JSON-returning endpoint
• No option for using ApiControllers (can change in the future as NativeAOT support expands)

Thanks for contacting us.

We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[DamianEdwards]

Completed in #43756