Support MS's Source Generators

[petrsvihlik]

Blockers

• https://github.com/dotnet/roslyn/issues/43903

Motivation

Make the automatic compile-time source generation easier. This could remove the necessity of adding MSBuild targets such as:

https://github.com/Kentico/kontent-boilerplate-net/blob/107137dedc4ffca29ce17013e20df36a3e507782/src/content/Kentico.Kontent.Boilerplate/Kentico.Kontent.Boilerplate.csproj#L39-L52

Proposed solution

• Support Microsoft.CodeAnalysis.ISourceGenerator and Microsoft.CodeAnalysis.GeneratorAttribute.

Additional context

• Feature overview
• Cookbook
• Samples
• Intro blog
• Intro video
• Tests
  • https://github.com/dotnet/roslyn/issues/44075
  • https://github.com/b-straub/BlazorSourceGeneratorTests

[petrsvihlik]

Initial work done here: https://github.com/petrsvihlik/kontent-source-generator