Closes #27369

The compiler added a block to prevent loading generators that are built
against the .NET Framework, since we know long term that we'll want them
to be runnable on .NET Core. The IDE helper that deals with converting
the error code to an IDE diagnostic needs to be updated to support this
new error, or otherwise Visual Studio will crash.

Fixes https://github.com/dotnet/roslyn/issues/47845

Co-authored-by: NSam Harwell <sam@tunnelvisionlabs.com>
Co-authored-by: NManish Vasani <mavasani@microsoft.com>
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Co-authored-by: NCyrus Najmabadi <cyrus.najmabadi@gmail.com>
Co-authored-by: NDavid Wengier <david.wengier@microsoft.com>
Co-authored-by: NShen Chen <cos_ifne@hotmail.com>
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Co-authored-by: NSam Harwell <Sam.Harwell@microsoft.com>
Co-authored-by: NFredric Silberberg <frsilb@microsoft.com>
Co-authored-by: NGen Lu <gel@microsoft.com>
Co-authored-by: NPetr Onderka <gsvick@gmail.com>
Co-authored-by: NTomáš Matoušek <tmat@users.noreply.github.com>
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Co-authored-by: NShen Chen <shech@microsoft.com>
Co-authored-by: NShen Chen <Cosifne@users.noreply.github.com>
Co-authored-by: NChris Sienkiewicz <chsienki@microsoft.com>
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* Better handling of OOM and exceptions in EnC analyzer

* Do not trigger fail fast on OOM exception unless the process actually runs out of memory

Implement ability to extract code into a new base class if there is no other base class already. 

* Uses shared code with similar things like Extract Interface and Pull Members Up
* Shares UI with those two features as well 

Co-authored-by: NCyrusNajmabadi <cyrus.najmabadi@gmail.com>
Co-authored-by: NDavid Wengier <dawengie@microsoft.com>

This moves the fetching of the nullable state into the first part of
quick info, which is figuring out the data/model. The function to take
that model and convert it to the display information can now go static
since it's not relying on other indirection.

variables of the desired type

None of this actually depended on the editor in any meaningful way.

* Add Solution.AnalyzerReferences

* HostDiagnosticAnalyzers

* Move types down to Workspaces