feat: Better Mono stacktraces

[bruno-garcia]

/cc @lucas-zimerman

As dad says: Let's rip off the bandaid.

Get some better Mono support for Unity (and Xamarin if that lives)

[codecov-io]

Codecov Report

Merging #578 (5f5c614) into main (db6d590) will increase coverage by 0.44%.
The diff coverage is 83.92%.

@@            Coverage Diff             @@
##             main     #578      +/-   ##
==========================================
+ Coverage   63.04%   63.48%   +0.44%     
==========================================
  Files         179      181       +2     
  Lines        5019     5130     +111     
  Branches      861      879      +18     
==========================================
+ Hits         3164     3257      +93     
- Misses       1627     1637      +10     
- Partials      228      236       +8     

Impacted Files	Coverage Δ
...rc/Sentry/Extensibility/SentryStackTraceFactory.cs	87.67% <ø> (ø)
src/Sentry/Protocol/Exceptions/SentryStackFrame.cs	100.00% <ø> (ø)
src/Sentry/Internal/StackFrameData.cs	77.14% <77.14%> (ø)
src/Sentry/Internal/MonoSentryStackTraceFactory.cs	94.59% <94.59%> (ø)
src/Sentry/SentryOptions.cs	93.33% <100.00%> (+0.22%)	⬆️

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