build: Generate Swift types from Sentry-Swift.h

[jpnurmi]

WIP

1. Lets Objective Sharpie generate bindings for everything in Sentry-Swift.h (Obj-C header auto-generated by the Swift compiler)
2. Uses Roslyn to filter out unnecessary C# types in ApiDefinitions.cs (because doing the same with regexps in PWSH is extremely difficult to get right)

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (version6@33615f4). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff             @@
##             version6    #4488   +/-   ##
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  Coverage            ?   73.09%           
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  Files               ?      479           
  Lines               ?    17386           
  Branches            ?     3432           
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  Hits                ?    12709           
  Misses              ?     3818           
  Partials            ?      859           

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[jpnurmi]

@jamescrosswell @Flash0ver There haven't been any Swift binding updates that required manual intervention recently, so I forgot I had this PR lying here. This can generate C# bindings for Swift types, so we'd no longer need those error-prone, manually crafted bindings in SwiftApiDefinitions.cs and SwiftStructsAndEnumes.cs. How do you like the approach? I think this PR in its current state would be a reasonable first step. Later on, we could even move more of that regexp manipulation from PWSH to C# and Roslyn to make it subjectively easier to maintain...