Introduce Analyzer

[viceroypenguin]

Diagnostics significantly reduce the cacheability of the ServiceRegistrationContext, since the values stored can change frequently when editing files. Diagnostics should only be emitted by analyzers and not by the generator itself.

[pwelter34]

Thanks for information. Do you have more information about this? Even better would be a reference implementation.

[viceroypenguin]

Explanation that you should from the Roslyn team themselves: https://github.com/dotnet/roslyn/blob/main/docs/features/incremental-generators.cookbook.md#issue-diagnostics

Example analyzers: https://github.com/ImmediatePlatform/Immediate.Handlers/tree/master/src/Immediate.Handlers.Analyzers

Example tests for analyzers: https://github.com/ImmediatePlatform/Immediate.Handlers/tree/master/tests/Immediate.Handlers.Tests/AnalyzerTests

[pwelter34]

Thank you for the detail. I'll have that changed in the next release.