fix: gather metric samples at profile start/end

[armcknight]

📜 Description

Gather a metric sample right at the beginning and end of a profile.

💡 Motivation and Context

We previously gathered metrics samples at 100 Hz, but not until the first 100 ms of a profile had elapsed, and there could've been up to 99ms without a sample at the end of a profile.

💚 How did you test it?

Unit test update.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1253.38 ms	1267.86 ms	14.48 ms
Size	22.85 KiB	407.87 KiB	385.02 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
be2977c	1202.51 ms	1221.32 ms	18.81 ms
c00eafe	1253.04 ms	1256.41 ms	3.37 ms
b9d59f7	1250.71 ms	1257.78 ms	7.06 ms
e1eed6b	1224.63 ms	1234.84 ms	10.20 ms
bd2afa6	1241.37 ms	1246.20 ms	4.83 ms
ea73af6	1230.96 ms	1244.98 ms	14.02 ms
d760c3f	1228.58 ms	1246.22 ms	17.64 ms
f4e0299	1230.33 ms	1249.68 ms	19.35 ms
c50d363	1215.10 ms	1231.82 ms	16.72 ms
0d32275	1245.80 ms	1267.80 ms	22.00 ms

App size

Revision	Plain	With Sentry	Diff
be2977c	22.85 KiB	407.67 KiB	384.83 KiB
c00eafe	20.76 KiB	432.88 KiB	412.12 KiB
b9d59f7	22.85 KiB	405.77 KiB	382.93 KiB
e1eed6b	20.76 KiB	432.17 KiB	411.41 KiB
bd2afa6	20.76 KiB	420.55 KiB	399.79 KiB
ea73af6	20.76 KiB	425.75 KiB	404.99 KiB
d760c3f	22.84 KiB	403.17 KiB	380.33 KiB
f4e0299	20.76 KiB	427.54 KiB	406.78 KiB
c50d363	20.76 KiB	432.68 KiB	411.92 KiB
0d32275	22.84 KiB	403.14 KiB	380.29 KiB

Previous results on branch: armcknight/fix/profiling-metric-collection-start-end

Startup times

Revision	Plain	With Sentry	Diff
b7841c0	1215.61 ms	1235.82 ms	20.21 ms
dcc5dc6	1247.71 ms	1258.12 ms	10.41 ms

App size

Revision	Plain	With Sentry	Diff
b7841c0	22.85 KiB	407.75 KiB	384.90 KiB
dcc5dc6	22.85 KiB	407.82 KiB	384.97 KiB

[codecov]

Codecov Report

Merging #3272 (359e03a) into main (881a955) will decrease coverage by 0.028%.
The diff coverage is 95.348%.

@@              Coverage Diff              @@
##              main     #3272       +/-   ##
=============================================
- Coverage   89.223%   89.195%   -0.028%     
=============================================
  Files          501       502        +1     
  Lines        53949     54273      +324     
  Branches     19170     19485      +315     
=============================================
+ Hits         48135     48409      +274     
- Misses        4958      4999       +41     
- Partials       856       865        +9     

Files Changed	Coverage
Sources/Sentry/SentryProfiler.mm	75.000%
Sources/Sentry/SentryDispatchSourceWrapper.m	100.000%
Sources/Sentry/SentryMetricProfiler.mm	100.000%
Sources/Sentry/SentryTracer.m	100.000%
...SentryProfilerTests/SentryProfilerSwiftTests.swift	100.000%

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[brustolin]

LGTM

[github-actions]

	Fails
🚫	Please consider adding a changelog entry for the next release.

Instructions and example for changelog

Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

Example:

## Unreleased

- gather metric samples at profile start/end ([#3272](https://github.com/getsentry/sentry-cocoa/pull/3272))

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