[TimothyMakkison]

Redo of #1753, this time focusing on individual cases.

• Added some basic tests.
• I intend to keep InterfaceStubGenerator in the main tests to target the latest version of .NET framework if possible. I'm trying not to use unsafe code in a rewrite, but if I do .NET Framework will have to be handled uniquely.
• Using this in my source generator rewrite, I'm trying to split it into smaller PRs so I don't dump a massive change on you.
• Got a pr with Verify.SourceGenerator to add a way to ignore certain files. I'd like to use it on the duplicate PreserveAttribute.cs files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.58%. Comparing base (6ebeda5) to head (71d9653).
Report is 63 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1765      +/-   ##
==========================================
- Coverage   87.73%   83.58%   -4.15%     
==========================================
  Files          33       36       +3     
  Lines        2348     2431      +83     
  Branches      294      343      +49     
==========================================
- Hits         2060     2032      -28     
- Misses        208      316     +108     
- Partials       80       83       +3     

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[github-actions]

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