Feature: Add threads for Android platform exceptions

[ueman]

📜 Description

Adds thread for android platform exception.

Example event: https://sentry.io/organizations/sentry-sdks/issues/3228921456/events/749fddaffc164a34a6efd82aba0f7f80/?project=5428562

💡 Motivation and Context

Fixes #841

💚 How did you test it?

• New tests

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

• Test this together with Report isolate as thread #847

[codecov-commenter]

Codecov Report

Merging #853 (321e12d) into main (dcf755c) will increase coverage by 0.02%.
The diff coverage is 96.42%.

@@            Coverage Diff             @@
##             main     #853      +/-   ##
==========================================
+ Coverage   90.30%   90.33%   +0.02%     
==========================================
  Files         119      119              
  Lines        3764     3785      +21     
==========================================
+ Hits         3399     3419      +20     
- Misses        365      366       +1     

Impacted Files	Coverage Δ
...or/android_platform_exception_event_processor.dart	96.51% <96.42%> (-0.42%)	⬇️

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[brustolin]

I'm not sure about the thread naming conventions, @marandaneto probably have better understanding of this.

The rest LGTM.

[ueman]

After thinking a little bit more about it: I think it makes the most sense if the Android thread is marked as current = false, crashed = true and the Dart isolate is marked as current = true, crashed = false. What do you think?