feat: Report fatal app hangs for V2

[philipphofmann]

📜 Description

This PR reports fatal app hangs without session updates, only when the experimental option enableAppHangTrackingV2 is enabled. Updating the session will be done in a follow-up PR.

💡 Motivation and Context

This fixes the first part of GH-4260.

💚 How did you test it?

Unit tests and an archived build distributed for development cause the watchdog doesn't terminate debug builds or simply takes a very long time to do that.

https://sentry-sdks.sentry.io/issues/6328843559/events/c79567d75edf48299845a55e2063a700/?project=5428557

https://sentry-sdks.sentry.io/issues/6328844382/events/8f9916263d124370b28d434f1647133d/?project=5428557

📝 Checklist

You have to check all boxes before merging:

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

I will update the docs for fatal app hangs after I added the session updates.

[github-actions]

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

Generated by 🚫 dangerJS against 229ae87

[codecov]

Codecov Report

Attention: Patch coverage is 98.23322% with 5 lines in your changes missing coverage. Please review.

Project coverage is 92.399%. Comparing base (5ea7b5a) to head (229ae87).

Files with missing lines	Patch %	Lines
...ations/ANR/SentryANRTrackingIntegrationTests.swift	97.037%	4 Missing ⚠️
Sources/Sentry/SentryANRTrackingIntegration.m	98.305%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4889       +/-   ##
=============================================
+ Coverage   92.369%   92.399%   +0.029%     
=============================================
  Files          659       660        +1     
  Lines        77548     77806      +258     
  Branches     28079     28207      +128     
=============================================
+ Hits         71631     71892      +261     
+ Misses        5821      5817        -4     
- Partials        96        97        +1     

Files with missing lines	Coverage Δ
Sources/Swift/Integrations/ANR/SentryANRType.swift	100.000% <100.000%> (ø)
...tryTests/Integrations/ANR/SentryANRTypeTests.swift	100.000% <100.000%> (ø)
Sources/Sentry/SentryANRTrackingIntegration.m	99.337% <98.305%> (+0.222%)	⬆️
...ations/ANR/SentryANRTrackingIntegrationTests.swift	96.685% <97.037%> (+0.058%)	⬆️

... and 13 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1219.73 ms	1239.14 ms	19.41 ms
Size	22.31 KiB	823.82 KiB	801.51 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
26530fe	1233.98 ms	1250.06 ms	16.08 ms
6610ef1	1220.33 ms	1225.61 ms	5.28 ms
7fb7afb	1202.18 ms	1219.42 ms	17.24 ms
b8dd0fc	1235.57 ms	1253.12 ms	17.55 ms
443723a	1205.24 ms	1220.52 ms	15.28 ms
2b19b82	1226.73 ms	1243.27 ms	16.53 ms
4be2b3c	1220.47 ms	1223.88 ms	3.41 ms
5d6ce0e	1227.57 ms	1241.08 ms	13.51 ms
9dbf743	1252.10 ms	1262.10 ms	10.00 ms
e34db45	1211.48 ms	1224.45 ms	12.97 ms

App size

Revision	Plain	With Sentry	Diff
26530fe	21.58 KiB	714.93 KiB	693.35 KiB
6610ef1	21.58 KiB	699.25 KiB	677.67 KiB
7fb7afb	20.76 KiB	419.70 KiB	398.94 KiB
b8dd0fc	20.76 KiB	401.39 KiB	380.63 KiB
443723a	20.76 KiB	414.44 KiB	393.68 KiB
2b19b82	21.58 KiB	542.18 KiB	520.60 KiB
4be2b3c	20.76 KiB	393.37 KiB	372.61 KiB
5d6ce0e	22.85 KiB	405.38 KiB	382.53 KiB
9dbf743	20.76 KiB	434.94 KiB	414.18 KiB
e34db45	21.58 KiB	671.30 KiB	649.72 KiB