F# projects should support processing Analyzers

[TheAngryByrd]

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

👋 I'd like to start the discussion around supporting the detection and writing of AnalyzerAssembly in F# projects.

F# has community-supported analyzers and we follow the same pattern of packaging with the analyzers/dotnet/fs/ convention.

Currently, to support this in FsAutocomplete (the F# LSP for vs-code), we're doing this detection crudely in Ionide's Design-time build system Ionide/Proj-Info, but it would be better to move this into the SDK since it already has detection for C#/VB.

Describe the solution you'd like

I have a branch doing some minimal changes around this:

TheAngryByrd@08cde9f

This still needs tests for handling different compiler versions like roslyn does but I wanted to get feedback on the initial approach.

Additional context

@baronfel @T-Gro

[baronfel]

Thanks for raising this @TheAngryByrd. I think that your branch is a good chunk of the actual feature development, and think that we'd just need to see some of that additional test coverage in order to take that on.

Once implemented, though, the F# community would be responsible for determining what the versioning/compat story is for these analyzers. The SDK has some primitive version-grouping behaviors already that may be enough for F#'s needs, but that's a discussion that the F# development community could need to make.

Finally, the NuGet team is working on a spec right now around this same topic - it would be good if you could investigate that and verify if their spec would still properly apply to F# projects as-implemented.

cc @dsplaisted for asset-selection coverage