ref: Refactor app state manager to not use protocol

[noahsmartin]

This also needs to use a class instead of a protocol to finish the swift conversion

#skip-changelog

Closes #6453

[codecov]

Codecov Report

❌ Patch coverage is 98.82353% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.970%. Comparing base (aa643c5) to head (15649e2).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
Sources/Sentry/SentryDependencyContainer.m	80.000%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              main     #6452    +/-   ##
==========================================
  Coverage   86.970%   86.970%            
==========================================
  Files          449       450     +1     
  Lines        37637     37806   +169     
  Branches     17460     17496    +36     
==========================================
+ Hits         32733     32880   +147     
- Misses        4862      4883    +21     
- Partials        42        43     +1     

Files with missing lines	Coverage Δ
Sources/Sentry/SentryAppStartTracker.m	95.394% <ø> (ø)
Sources/Sentry/SentryAppStartTrackingIntegration.m	100.000% <100.000%> (ø)
Sources/Sentry/SentryCrashIntegration.m	99.200% <100.000%> (ø)
Sources/Sentry/SentryDefaultAppStateManager.m	100.000% <100.000%> (ø)
Sources/Sentry/SentryWatchdogTerminationLogic.m	83.050% <ø> (ø)
Sources/Sentry/SentryWatchdogTerminationTracker.m	100.000% <ø> (ø)
...try/SentryWatchdogTerminationTrackingIntegration.m	85.714% <100.000%> (ø)
Sources/Swift/SentryAppState.swift	97.115% <100.000%> (+0.056%)	⬆️
Sources/Swift/SentryAppStateManager.swift	100.000% <100.000%> (ø)
Sources/Sentry/SentryDependencyContainer.m	90.254% <80.000%> (ø)

... and 19 files with indirect coverage changes

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[itaybre]

LGTM

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1235.92 ms	1252.46 ms	16.54 ms
Size	23.75 KiB	1021.19 KiB	997.44 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
2be5991	1228.55 ms	1264.65 ms	36.10 ms
aa96485	1215.37 ms	1234.04 ms	18.67 ms
80538ca	1216.70 ms	1253.92 ms	37.22 ms
d1c0538	1227.49 ms	1246.96 ms	19.47 ms
83d27f6	1233.56 ms	1259.24 ms	25.68 ms
1339919	1214.82 ms	1238.98 ms	24.16 ms
4bf98bf	1219.13 ms	1244.50 ms	25.38 ms
daeeb27	1235.35 ms	1253.77 ms	18.42 ms
bce9765	1229.42 ms	1243.49 ms	14.07 ms
04435e6	1226.81 ms	1252.56 ms	25.75 ms

App size

Revision	Plain	With Sentry	Diff
2be5991	23.75 KiB	994.73 KiB	970.98 KiB
aa96485	23.75 KiB	874.46 KiB	850.71 KiB
80538ca	23.75 KiB	989.99 KiB	966.24 KiB
d1c0538	23.75 KiB	928.87 KiB	905.12 KiB
83d27f6	23.75 KiB	928.88 KiB	905.13 KiB
1339919	23.75 KiB	919.70 KiB	895.95 KiB
4bf98bf	23.75 KiB	919.70 KiB	895.95 KiB
daeeb27	23.75 KiB	989.12 KiB	965.37 KiB
bce9765	23.74 KiB	874.06 KiB	850.32 KiB
04435e6	23.75 KiB	1010.41 KiB	986.66 KiB

Previous results on branch: appStateManagerRefactor

Startup times

Revision	Plain	With Sentry	Diff
77ab3e4	1214.74 ms	1243.29 ms	28.55 ms

App size

Revision	Plain	With Sentry	Diff
77ab3e4	23.75 KiB	1018.69 KiB	994.94 KiB