WIP: try inproc with libunwind

[jpnurmi]

See:

• fix: split inproc handler thread sentry-native#1446
• vendor libunwind for Linux sentry-native#1523

[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

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Dependencies ⬆️

Deps

• Apps built using the Sentry SDK for .NET must now target iOS version 15 or higher. Previously only version 13 or higher was required. (#4781) by github-actions in #4781
• Bump Cocoa SDK from v8.57.3 to v9.2.0 (#4781) by github-actions in #4781
  • changelog
  • diff
• chore(deps): update Native SDK to v0.12.7 by github-actions in #4920

Other

• WIP: try inproc with libunwind by jpnurmi in #4926

• test(android): Use volatile to produce SIGSEGV in native crash test by jpnurmi in #4919

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[github-actions]

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## Unreleased

### Features

- try inproc with libunwind ([#4926](https://github.com/getsentry/sentry-dotnet/pull/4926))

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.86%. Comparing base (c999f5a) to head (512c687).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4926   +/-   ##
=======================================
  Coverage   73.86%   73.86%           
=======================================
  Files         496      496           
  Lines       17927    17927           
  Branches     3511     3511           
=======================================
+ Hits        13241    13242    +1     
+ Misses       3826     3824    -2     
- Partials      860      861    +1     

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