fix(metrics): Data Normalization

[philipphofmann]

📜 Description

Update metrics data normalization to spec.

💡 Motivation and Context

Fixes GH-3829

💚 How did you test it?

Unit tests

📝 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.964%. Comparing base (c0f08e7) to head (02925a8).

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #3843       +/-   ##
=============================================
+ Coverage   90.948%   90.964%   +0.016%     
=============================================
  Files          560       560               
  Lines        44256     44271       +15     
  Branches     15779     15776        -3     
=============================================
+ Hits         40250     40271       +21     
+ Misses        3936      3820      -116     
- Partials        70       180      +110     

Files	Coverage Δ
Sources/Swift/Metrics/EncodeMetrics.swift	100.000% <100.000%> (ø)
.../SentryTests/Swift/Metrics/EncodeMetricTests.swift	100.000% <100.000%> (ø)

... and 33 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 c0f08e7...02925a8. Read the comment docs.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1233.33 ms	1250.23 ms	16.90 ms
Size	21.58 KiB	574.17 KiB	552.59 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
8838e54	1252.06 ms	1258.20 ms	6.14 ms
b15521e	1246.51 ms	1262.96 ms	16.45 ms
89b12eb	1236.02 ms	1246.63 ms	10.61 ms
45d3ca5	1248.27 ms	1255.48 ms	7.21 ms
42ef6ba	1201.67 ms	1214.35 ms	12.67 ms
742d4b6	1230.41 ms	1247.23 ms	16.83 ms
46267d8	1229.80 ms	1244.16 ms	14.37 ms
443723a	1205.24 ms	1220.52 ms	15.28 ms
e90aa6d	1277.38 ms	1303.18 ms	25.81 ms
f25febb	1224.69 ms	1247.38 ms	22.68 ms

App size

Revision	Plain	With Sentry	Diff
8838e54	22.85 KiB	413.45 KiB	390.60 KiB
b15521e	21.58 KiB	573.17 KiB	551.59 KiB
89b12eb	20.76 KiB	432.88 KiB	412.11 KiB
45d3ca5	20.76 KiB	427.54 KiB	406.78 KiB
42ef6ba	21.58 KiB	417.86 KiB	396.28 KiB
742d4b6	21.58 KiB	546.20 KiB	524.62 KiB
46267d8	21.58 KiB	572.21 KiB	550.63 KiB
443723a	20.76 KiB	414.44 KiB	393.68 KiB
e90aa6d	21.58 KiB	418.82 KiB	397.24 KiB
f25febb	21.58 KiB	414.92 KiB	393.34 KiB