ref(profiling): extract methods related to profile serialization

[armcknight]

Following on #3875, for #3555, #skip-changelog

Extract the logic that dealt with serializing profile data and creating envelope items to SentrySerialization et al. There was a linear chain of methods/functions that would be called in this process; they have been flattened into as few functions as possible.

[codecov]

Codecov Report

Attention: Patch coverage is 89.14286% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 90.529%. Comparing base (135dec6) to head (0b3796f).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3876       +/-   ##
=============================================
- Coverage   90.632%   90.529%   -0.103%     
=============================================
  Files          580       580               
  Lines        45294     45203       -91     
  Branches     16113     16059       -54     
=============================================
- Hits         41051     40922      -129     
- Misses        4173      4211       +38     
  Partials        70        70               

Files	Coverage Δ
Sources/Sentry/PrivateSentrySDKOnly.mm	86.792% <100.000%> (-0.364%)	⬇️
Sources/Sentry/SentryProfiler.mm	89.743% <100.000%> (+0.469%)	⬆️
Sources/Sentry/SentryTracer.m	96.650% <100.000%> (-0.247%)	⬇️
Tests/SentryProfilerTests/SentryProfilerTests.mm	98.773% <100.000%> (ø)
...es/Sentry/Profiling/SentryProfilerSerialization.mm	88.414% <88.414%> (ø)

... and 23 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 135dec6...0b3796f. Read the comment docs.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1225.91 ms	1248.76 ms	22.84 ms
Size	21.58 KiB	615.29 KiB	593.71 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
be51b56	1220.84 ms	1249.36 ms	28.52 ms
ddb4778	1245.36 ms	1254.16 ms	8.80 ms
216bdf9	1202.57 ms	1215.45 ms	12.88 ms
596ccc1	1233.51 ms	1244.24 ms	10.73 ms
2f9c5f9	1218.78 ms	1239.58 ms	20.80 ms
56baaef	1241.60 ms	1260.51 ms	18.91 ms
45d3ca5	1248.27 ms	1255.48 ms	7.21 ms
626b91b	1231.67 ms	1247.13 ms	15.46 ms
b9b0f0a	1220.20 ms	1229.27 ms	9.06 ms
d3630c3	1226.55 ms	1245.23 ms	18.68 ms

App size

Revision	Plain	With Sentry	Diff
be51b56	20.76 KiB	432.20 KiB	411.44 KiB
ddb4778	21.58 KiB	414.92 KiB	393.34 KiB
216bdf9	21.58 KiB	418.13 KiB	396.54 KiB
596ccc1	22.84 KiB	401.44 KiB	378.60 KiB
2f9c5f9	21.58 KiB	418.82 KiB	397.24 KiB
56baaef	21.58 KiB	571.91 KiB	550.33 KiB
45d3ca5	20.76 KiB	427.54 KiB	406.78 KiB
626b91b	21.58 KiB	546.20 KiB	524.61 KiB
b9b0f0a	20.76 KiB	434.94 KiB	414.18 KiB
d3630c3	22.84 KiB	403.19 KiB	380.34 KiB

Previous results on branch: armcknight/feat/3555-continuous-profiling/4-refactoring/5-profile-serialization

Startup times

Revision	Plain	With Sentry	Diff
9e3a640	1222.90 ms	1238.35 ms	15.45 ms
b813174	1231.20 ms	1251.61 ms	20.41 ms

App size

Revision	Plain	With Sentry	Diff
9e3a640	21.58 KiB	615.29 KiB	593.71 KiB
b813174	21.58 KiB	615.38 KiB	593.80 KiB

[brustolin]

LGTM!

Just one suggestion.

[philipphofmann]

Thanks for splitting this up. LGTM