[NDK] Add loadNativeLibraries method to allow pre-loading .so files

[markushi]

sentry-java 7.x loads the .so libraries using a background thread, see getsentry/sentry-java#3670

Instead of porting this behaviour 1:1 to sentry-native, I'm proposing a new .loadNativeLibraries() method, allowing you to pre-load the libraries if necessary. It's up to the consumer, like sentry-java 8.x to use this method, and e.g. call it on a background thread.

This is a change in behaviour, as the .so files no longer get loaded during class init.

[github-actions]

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📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against b5d3b83

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.34%. Comparing base (d8230a8) to head (b5d3b83).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1082      +/-   ##
==========================================
- Coverage   82.40%   82.34%   -0.07%     
==========================================
  Files          53       53              
  Lines        7752     7752              
  Branches     1216     1216              
==========================================
- Hits         6388     6383       -5     
- Misses       1252     1257       +5     
  Partials      112      112              

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[supervacuus]

We already talked about how little love I have for static init blocks, but for a library, it makes even less sense since different clients have different needs. LGTM.