fix: Reading applicationState in the background

[brustolin]

Keep track of application state by notification instead of reading directly from UIApplication. This way we avoid using UIApplication in the background thread when detecting an ANR.

#skip-changelog

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1232.50 ms	1248.00 ms	15.50 ms
Size	22.85 KiB	411.93 KiB	389.08 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
a176fc4	1226.24 ms	1247.50 ms	21.26 ms
51307b7	1223.08 ms	1240.76 ms	17.68 ms
8f212af	1246.41 ms	1270.98 ms	24.57 ms
621ba9b	1190.66 ms	1230.84 ms	40.18 ms
56ec5d0	1236.65 ms	1261.90 ms	25.25 ms
c6773e5	1222.48 ms	1240.02 ms	17.54 ms
98cca71	1230.43 ms	1252.36 ms	21.93 ms
5b6694b	1221.71 ms	1259.06 ms	37.35 ms
69d8759	1229.88 ms	1240.45 ms	10.57 ms
d253cdf	1231.61 ms	1259.52 ms	27.91 ms

App size

Revision	Plain	With Sentry	Diff
a176fc4	22.84 KiB	403.24 KiB	380.39 KiB
51307b7	22.85 KiB	407.63 KiB	384.78 KiB
8f212af	22.84 KiB	403.14 KiB	380.29 KiB
621ba9b	20.76 KiB	414.45 KiB	393.69 KiB
56ec5d0	20.76 KiB	414.44 KiB	393.69 KiB
c6773e5	20.76 KiB	435.25 KiB	414.49 KiB
98cca71	22.85 KiB	411.14 KiB	388.29 KiB
5b6694b	20.76 KiB	426.11 KiB	405.34 KiB
69d8759	20.76 KiB	393.05 KiB	372.29 KiB
d253cdf	20.76 KiB	427.66 KiB	406.90 KiB

Previous results on branch: fix/reading-applicationState

Startup times

Revision	Plain	With Sentry	Diff
acd1676	1207.94 ms	1226.78 ms	18.84 ms
bf85bdd	1258.86 ms	1276.78 ms	17.92 ms
dc0d331	1246.68 ms	1256.45 ms	9.77 ms

App size

Revision	Plain	With Sentry	Diff
acd1676	22.85 KiB	411.80 KiB	388.95 KiB
bf85bdd	22.85 KiB	411.80 KiB	388.95 KiB
dc0d331	22.85 KiB	411.93 KiB	389.08 KiB

[codecov]

Codecov Report

Merging #3372 (75e0ce9) into main (dd0557f) will increase coverage by 0.054%.
The diff coverage is 96.153%.

@@              Coverage Diff              @@
##              main     #3372       +/-   ##
=============================================
+ Coverage   89.181%   89.236%   +0.054%     
=============================================
  Files          500       500               
  Lines        54683     54730       +47     
  Branches     19620     19640       +20     
=============================================
+ Hits         48767     48839       +72     
- Misses        4928      5021       +93     
+ Partials       988       870      -118     

Files	Coverage Δ
Sources/Sentry/SentryUIApplication.m	93.442% <100.000%> (+3.968%)	⬆️
Tests/SentryTests/SentryUIApplicationTests.swift	100.000% <100.000%> (ø)
...Tests/Helper/TestNSNotificationCenterWrapper.swift	66.666% <50.000%> (+9.523%)	⬆️

... and 34 files with indirect coverage changes

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[philipphofmann]

LGTM.

[philipphofmann]

m: I don't this requires a changelog entry as it fixes a fix 😄