feat: Add Metrics API

[philipphofmann]

📜 Description

Add beta implementation of MetricsAPI.

💡 Motivation and Context

#3631

Docs PR getsentry/sentry-docs#9554.

💚 How did you test it?

Unit tests and simulator.

📝 Checklist

You have to check all boxes before merging:

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

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

Generated by 🚫 dangerJS against 9aed2e3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.511%. Comparing base (69d2789) to head (9aed2e3).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3791       +/-   ##
=============================================
+ Coverage   89.473%   89.511%   +0.038%     
=============================================
  Files          557       559        +2     
  Lines        60247     60542      +295     
  Branches     21669     21747       +78     
=============================================
+ Hits         53905     54192      +287     
- Misses        5306      5426      +120     
+ Partials      1036       924      -112     

Files	Coverage Δ
Sources/Sentry/SentryHub.m	98.611% <100.000%> (+0.091%)	⬆️
Sources/Sentry/SentryNSDataUtils.m	95.652% <100.000%> (+0.414%)	⬆️
Sources/Sentry/SentryOptions.m	97.703% <100.000%> (+0.039%)	⬆️
Sources/Sentry/SentrySDK.m	90.681% <100.000%> (+0.101%)	⬆️
Sources/Sentry/SentrySpan.m	98.522% <100.000%> (+0.068%)	⬆️
Sources/Sentry/SentryTransaction.m	87.654% <100.000%> (+0.987%)	⬆️
...urces/Swift/Metrics/BucketsMetricsAggregator.swift	100.000% <100.000%> (ø)
Sources/Swift/Metrics/LocalMetricsAggregator.swift	100.000% <100.000%> (ø)
Sources/Swift/Metrics/SentryMetricsAPI.swift	100.000% <100.000%> (ø)
Sources/Swift/Metrics/SetMetric.swift	100.000% <100.000%> (ø)
... and 10 more

... and 46 files with indirect coverage changes

---

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[brustolin]

LGTM!

I have just one suggestion.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1234.25 ms	1252.13 ms	17.88 ms
Size	21.58 KiB	571.85 KiB	550.27 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
01a28a9	1237.24 ms	1253.24 ms	16.00 ms
60bfc91	1220.39 ms	1250.89 ms	30.50 ms
8aba9c4	1236.94 ms	1248.29 ms	11.35 ms
72c8d84	1257.34 ms	1276.96 ms	19.62 ms
e90aa6d	1277.38 ms	1303.18 ms	25.81 ms
84fb4d9	1212.45 ms	1223.39 ms	10.94 ms
98a8c16	1206.40 ms	1232.14 ms	25.74 ms
ecd9ecd	1191.76 ms	1216.92 ms	25.16 ms
7cd187e	1243.56 ms	1250.20 ms	6.64 ms
2b55154	1231.36 ms	1247.82 ms	16.46 ms

App size

Revision	Plain	With Sentry	Diff
01a28a9	22.85 KiB	405.39 KiB	382.54 KiB
60bfc91	20.76 KiB	434.94 KiB	414.18 KiB
8aba9c4	21.58 KiB	544.72 KiB	523.14 KiB
72c8d84	22.85 KiB	408.88 KiB	386.03 KiB
e90aa6d	21.58 KiB	418.82 KiB	397.24 KiB
84fb4d9	22.84 KiB	402.56 KiB	379.72 KiB
98a8c16	20.76 KiB	431.00 KiB	410.24 KiB
ecd9ecd	20.76 KiB	420.23 KiB	399.47 KiB
7cd187e	20.76 KiB	401.65 KiB	380.89 KiB
2b55154	22.84 KiB	402.19 KiB	379.34 KiB

Previous results on branch: feat/metrics

Startup times

Revision	Plain	With Sentry	Diff
3303cb5	1230.40 ms	1235.86 ms	5.46 ms

App size

Revision	Plain	With Sentry	Diff
3303cb5	21.58 KiB	571.42 KiB	549.84 KiB