feat(profiling): continuous profiler basic implementation

[armcknight]

For #3555; #skip-changelog

• further refactor the current profiling implementation in order to make space for the new one as a parallel to the legacy logic
• carry over some basic functionality from the legacy profiler controls so it can run
• create a test case that starts and stops it to ensure that it at least doesn't crash

Starting and stopping automatically on given events, including launch profiling, will be handled in a subsequent PR.

This extracts the remaining class functions from SentryProfiler.mm to a new class SentryLegacyProfiler, to parallel the previously created and stubbed SentryContinuousProfiler.

All that then remains of SentryProfiler are the instance methods. Both the legacy and continuous classes will use an instance of SentryProfiler and control it with their respective specified behaviors. SentryProfiler is now initialized with an enum to specify whether it is running in legacy or continuous mode. It will use this to e.g. decide what to do when its timer expires (stop profiling in legacy, send a chunk in continuous–this part is also left for a later PR).

Also renamed SentryProfilerSwiftTests.swift to SentryLegacyProfilerTests and created a new SentryContinuousProfilerTests class, and factored out the fixture to a separate file in SentryProfileTestFixture.

[github-actions]

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

Generated by 🚫 dangerJS against 8f6f361

[codecov]

Codecov Report

Attention: Patch coverage is 97.77778% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 90.806%. Comparing base (7bdf989) to head (8f6f361).
Report is 2 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3913       +/-   ##
=============================================
- Coverage   90.806%   90.806%   -0.001%     
=============================================
  Files          588       591        +3     
  Lines        45879     45954       +75     
  Branches     16370     16410       +40     
=============================================
+ Hits         41661     41729       +68     
- Misses        4148      4155        +7     
  Partials        70        70               

Files	Coverage Δ
SentryTestUtils/ClearTestState.swift	100.000% <100.000%> (ø)
Sources/Sentry/PrivateSentrySDKOnly.mm	91.549% <100.000%> (ø)
...entry/Profiling/SentryProfiledTracerConcurrency.mm	97.368% <ø> (ø)
Sources/Sentry/SentryFramesTracker.m	99.186% <100.000%> (+0.013%)	⬆️
Sources/Sentry/SentryProfiler.mm	89.600% <100.000%> (-0.144%)	⬇️
Sources/Sentry/SentryTracer.m	97.607% <100.000%> (+0.717%)	⬆️
...yProfilerTests/SentryContinuousProfilerTests.swift	100.000% <100.000%> (ø)
...entryProfilerTests/SentryLegacyProfilerTests.swift	98.333% <100.000%> (ø)
Tests/SentryProfilerTests/SentryProfilerTests.mm	68.000% <100.000%> (+2.355%)	⬆️
...ance/FramesTracking/SentryFramesTrackerTests.swift	99.491% <100.000%> (ø)
... and 3 more

... and 7 files with indirect coverage changes

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1234.38 ms	1250.75 ms	16.37 ms
Size	21.58 KiB	617.83 KiB	596.25 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
eb41178	1228.06 ms	1248.37 ms	20.31 ms
25d925a	1232.89 ms	1248.41 ms	15.52 ms
ce4cfaf	1203.61 ms	1218.86 ms	15.25 ms
ee8b48f	1204.04 ms	1216.70 ms	12.66 ms
50bbebb	1234.76 ms	1246.66 ms	11.90 ms
369222e	1232.14 ms	1258.90 ms	26.76 ms
e1cd9e9	1203.93 ms	1239.12 ms	35.19 ms
83d84d7	1244.92 ms	1253.34 ms	8.42 ms
5f8ee7a	1253.96 ms	1264.98 ms	11.02 ms
9dbf743	1252.10 ms	1262.10 ms	10.00 ms

App size

Revision	Plain	With Sentry	Diff
eb41178	21.58 KiB	544.86 KiB	523.28 KiB
25d925a	21.58 KiB	418.82 KiB	397.24 KiB
ce4cfaf	20.76 KiB	423.19 KiB	402.43 KiB
ee8b48f	21.58 KiB	418.70 KiB	397.11 KiB
50bbebb	21.58 KiB	414.96 KiB	393.38 KiB
369222e	20.76 KiB	419.67 KiB	398.91 KiB
e1cd9e9	22.85 KiB	412.95 KiB	390.10 KiB
83d84d7	22.84 KiB	402.56 KiB	379.72 KiB
5f8ee7a	22.85 KiB	411.93 KiB	389.08 KiB
9dbf743	20.76 KiB	434.94 KiB	414.18 KiB

Previous results on branch: armcknight/feat/3555-continuous-profiling/5-implementation/1-continuous-profiling

Startup times

Revision	Plain	With Sentry	Diff
bcfe763	1238.71 ms	1252.82 ms	14.11 ms
69a92e8	1230.06 ms	1249.22 ms	19.16 ms

App size

Revision	Plain	With Sentry	Diff
bcfe763	21.58 KiB	614.95 KiB	593.37 KiB
69a92e8	21.58 KiB	617.11 KiB	595.52 KiB

[brustolin]

Looks good for me. Thanks!!

[philipphofmann]

LGTM, with mostly nitpicks.

[philipphofmann]

Again LGTM