Add abnormal_mechanism to sessions for ANR rate calculation

[romtsn]

📜 Description

This PR contains 3 main changes:

• Distinguishes between foreground and background ANRs based on LifecycleWatcher callbacks
• Force attaches thread dump to the ANR events for easier fixing
• Introduces new field abnormal_mechanism to the Session payload, which is set when user experienced an ANR event and which is used for ANR rate calculation on the product side

💡 Motivation and Context

Q1 Goal (ANR rate and improvements)

💚 How did you test it?

Manually and automated

📝 Checklist

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

🔮 Next steps

[github-actions]

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

Generated by 🚫 dangerJS against 2bdea36

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	314.36 ms	352.96 ms	38.60 ms
Size	1.73 MiB	2.33 MiB	619.53 KiB

Previous results on branch: feat/anr-rate-v1

Startup times

Revision	Plain	With Sentry	Diff
b872136	334.37 ms	349.40 ms	15.03 ms
82a9a16	354.77 ms	393.67 ms	38.90 ms
aa715bc	335.65 ms	384.90 ms	49.25 ms
61ea1d3	312.40 ms	346.45 ms	34.05 ms

App size

Revision	Plain	With Sentry	Diff
b872136	1.73 MiB	2.33 MiB	619.69 KiB
82a9a16	1.73 MiB	2.33 MiB	619.69 KiB
aa715bc	1.73 MiB	2.33 MiB	619.65 KiB
61ea1d3	1.73 MiB	2.33 MiB	619.69 KiB

[codecov]

Codecov Report

Base: 80.13% // Head: 80.16% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (2bdea36) compared to base (9b6c37f).
Patch coverage: 96.66% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2475      +/-   ##
============================================
+ Coverage     80.13%   80.16%   +0.02%     
- Complexity     3873     3882       +9     
============================================
  Files           312      313       +1     
  Lines         14672    14695      +23     
  Branches       1943     1947       +4     
============================================
+ Hits          11758    11780      +22     
- Misses         2153     2154       +1     
  Partials        761      761              

Impacted Files	Coverage Δ
...entry/src/main/java/io/sentry/SentryBaseEvent.java	90.90% <ø> (ø)
...ry/src/main/java/io/sentry/hints/AbnormalExit.java	0.00% <0.00%> (ø)
...ry/src/main/java/io/sentry/MainEventProcessor.java	85.51% <100.00%> (+0.51%)	⬆️
sentry/src/main/java/io/sentry/SentryClient.java	86.84% <100.00%> (+0.15%)	⬆️
...y/src/main/java/io/sentry/SentryThreadFactory.java	97.36% <100.00%> (+0.07%)	⬆️
sentry/src/main/java/io/sentry/Session.java	94.39% <100.00%> (+0.30%)	⬆️

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[markushi]

Nice one, LGTM!