feat(profiling): continuous profile serialization schema

[armcknight]

#skip-changelog, for #3555

Implements the necessary schema changes for how continuous profiling chunks will be serialized, and their envelope structure. This was cribbed from the current functions that do the same for legacy profiles (sentry_serializedProfileDataLegacy and sentry_profileEnvelopeItemLegacy) to create sentry_serializedContinuousProfileChunk and sentry_continuousProfileChunkEnvelope.

Also implements the timer logic to transmit those envelopes every time it fires in SentryProfiler.mm.

Added assertions for the new schema to SentryContinuousProfilerTests.swift. Those tests will simulate sending multiple chunks per test, validating the contents of each, which have unique data per chunk to ensure the same data isn't carrying over, and that the profiler is still running after transmitting each until the profiler is explicitly stopped.

[github-actions]

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

Generated by 🚫 dangerJS against 122be7a

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1222.35 ms	1231.27 ms	8.92 ms
Size	21.58 KiB	629.71 KiB	608.13 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
7bb0873	1360.94 ms	1362.24 ms	1.30 ms
dc0db9e	1222.10 ms	1240.90 ms	18.80 ms
5e65d2b	1216.08 ms	1236.08 ms	20.00 ms
62c15d4	1231.80 ms	1248.86 ms	17.06 ms
b35ccd0	1238.67 ms	1260.35 ms	21.67 ms
98713e6	1211.48 ms	1244.42 ms	32.94 ms
3f366ee	1244.49 ms	1257.28 ms	12.79 ms
b2f82fa	1237.78 ms	1256.02 ms	18.24 ms
42ef6ba	1219.58 ms	1245.37 ms	25.78 ms
3db3e35	1248.02 ms	1258.35 ms	10.33 ms

App size

Revision	Plain	With Sentry	Diff
7bb0873	22.85 KiB	407.09 KiB	384.24 KiB
dc0db9e	20.76 KiB	419.62 KiB	398.86 KiB
5e65d2b	21.58 KiB	616.67 KiB	595.09 KiB
62c15d4	22.85 KiB	411.14 KiB	388.29 KiB
b35ccd0	21.58 KiB	573.13 KiB	551.55 KiB
98713e6	20.76 KiB	435.22 KiB	414.46 KiB
3f366ee	20.76 KiB	427.84 KiB	407.08 KiB
b2f82fa	20.76 KiB	419.62 KiB	398.86 KiB
42ef6ba	21.58 KiB	417.86 KiB	396.28 KiB
3db3e35	21.58 KiB	419.21 KiB	397.63 KiB

Previous results on branch: armcknight/feat/3555-continuous-profiling/5-implementation/2-schema-serialization

Startup times

Revision	Plain	With Sentry	Diff
d9b4c67	1239.04 ms	1253.81 ms	14.77 ms
e78fbaf	1234.37 ms	1249.00 ms	14.63 ms
33bd2ca	1227.50 ms	1245.12 ms	17.62 ms

App size

Revision	Plain	With Sentry	Diff
d9b4c67	21.58 KiB	620.30 KiB	598.72 KiB
e78fbaf	21.58 KiB	620.26 KiB	598.68 KiB
33bd2ca	21.58 KiB	620.40 KiB	598.82 KiB

[codecov]

Codecov Report

Attention: Patch coverage is 87.85942% with 38 lines in your changes are missing coverage. Please review.

Project coverage is 90.855%. Comparing base (e072ad1) to head (122be7a).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3932       +/-   ##
=============================================
+ Coverage   90.844%   90.855%   +0.010%     
=============================================
  Files          593       594        +1     
  Lines        45974     46290      +316     
  Branches     16383     16554      +171     
=============================================
+ Hits         41765     42057      +292     
- Misses        4139      4163       +24     
  Partials        70        70               

Files	Coverage Δ
Sources/Sentry/PrivateSentrySDKOnly.mm	91.549% <100.000%> (ø)
Sources/Sentry/Profiling/SentryLegacyProfiler.mm	95.000% <ø> (ø)
Sources/Sentry/Profiling/SentryProfilerState.mm	99.264% <100.000%> (+0.022%)	⬆️
Sources/Sentry/SentryBacktrace.cpp	89.705% <ø> (-0.150%)	⬇️
Sources/Sentry/SentryDataCategoryMapper.m	97.142% <100.000%> (+0.267%)	⬆️
Sources/Sentry/SentryTracer.m	96.889% <100.000%> (+0.239%)	⬆️
...yProfilerTests/SentryContinuousProfilerTests.swift	100.000% <100.000%> (ø)
...entryProfilerTests/SentryLegacyProfilerTests.swift	98.333% <100.000%> (ø)
...SentryProfilerTests/SentryProfileTestFixture.swift	99.397% <100.000%> (-0.018%)	⬇️
Tests/SentryProfilerTests/SentryProfilerTests.mm	68.000% <100.000%> (ø)
... and 5 more

... and 22 files with indirect coverage changes

---

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[philipphofmann]

A couple of issues, but looking good already 👍

[philipphofmann]

LGTM, thanks 👍