ref: Add comment for CrashExceptionApplication

[philipphofmann]

Add a comment to explain why we need SentryCrashExceptionApplication.

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1255.48 ms	1262.92 ms	7.44 ms
Size	21.58 KiB	414.96 KiB	393.38 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
8f397a7	1251.82 ms	1268.34 ms	16.52 ms
53a8885	1241.02 ms	1270.66 ms	29.64 ms
5f8ee7a	1253.96 ms	1264.98 ms	11.02 ms
154f795	1225.53 ms	1231.04 ms	5.51 ms
e998fd0	1241.49 ms	1262.63 ms	21.14 ms
05644fe	1244.04 ms	1244.46 ms	0.42 ms
c0ff306	1219.24 ms	1243.96 ms	24.72 ms
7192d9e	1221.86 ms	1248.28 ms	26.42 ms
ef5821b	1253.18 ms	1265.46 ms	12.28 ms
b16d18c	1245.60 ms	1250.94 ms	5.34 ms

App size

Revision	Plain	With Sentry	Diff
8f397a7	20.76 KiB	420.55 KiB	399.79 KiB
53a8885	20.76 KiB	434.65 KiB	413.89 KiB
5f8ee7a	22.85 KiB	411.93 KiB	389.08 KiB
154f795	20.76 KiB	435.25 KiB	414.49 KiB
e998fd0	21.58 KiB	414.59 KiB	393.01 KiB
05644fe	22.85 KiB	408.88 KiB	386.03 KiB
c0ff306	20.76 KiB	434.65 KiB	413.89 KiB
7192d9e	20.76 KiB	431.71 KiB	410.95 KiB
ef5821b	21.58 KiB	414.96 KiB	393.37 KiB
b16d18c	20.76 KiB	437.12 KiB	416.36 KiB