expose IsSystemModuleName as a public static function.

[lucas-zimerman]

#skip-changelog.

I don' believe this function belongs to SentryOptionsExtensions since it's not exactly an extension to SentryOptions so leaving it on SentryStackTraceFactory may be thet best place from what I say.

The goal of this PR is to expose IsSystemModuleName so a proper fix can be implemented for getsentry/sentry-unity#575

[codecov-commenter]

Codecov Report

Merging #1493 (9d74cca) into main (b5acb72) will decrease coverage by 0.00%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1493      +/-   ##
==========================================
- Coverage   84.17%   84.17%   -0.01%     
==========================================
  Files         219      219              
  Lines        7383     7388       +5     
  Branches     1420     1421       +1     
==========================================
+ Hits         6215     6219       +4     
  Misses        732      732              
- Partials      436      437       +1     

Impacted Files	Coverage Δ
src/Sentry/Exceptions/SentryStackFrame.cs	76.92% <44.44%> (-4.79%)	⬇️
...rc/Sentry/Extensibility/SentryStackTraceFactory.cs	92.13% <100.00%> (+2.88%)	⬆️
src/Sentry/Internal/BackgroundWorker.cs	93.47% <0.00%> (+1.44%)	⬆️

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[SimonCropp]

i pushed a very minor xml doc improvement

[lucas-zimerman]

Looks good for me :)

[bruno-garcia]

There's a new public API which doesn't match the PR title and has no changelog entry.
Ideally we'd have user-facing changes in the changelog to help folks updating