Expose span baggage API

[denrase]

📜 Description

• Expose SentrySpanContext and SentryBaggage classes
• Add baggageHttpHeader and traceContext on SentrySpan protocol

💡 Motivation and Context

Closes #3519

📝 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

Exposing traceContext in SentrySpanProtocol makes it optional, also for SentryTracer implementations. Could this be an issue?

[github-actions]

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

Generated by 🚫 dangerJS against fe1cd3e

[codecov]

Codecov Report

Attention: Patch coverage is 97.67442% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.607%. Comparing base (df2835d) to head (fe1cd3e).
Report is 5 commits behind head on main.

Files	Patch %	Lines
Sources/Sentry/SentrySpan.m	50.000%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #4207       +/-   ##
=============================================
+ Coverage   91.601%   91.607%   +0.006%     
=============================================
  Files          617       617               
  Lines        50045     50059       +14     
  Branches     18096     18106       +10     
=============================================
+ Hits         45842     45858       +16     
+ Misses        4110      4108        -2     
  Partials        93        93               

Files	Coverage Δ
SentryTestUtils/TestTransportAdapter.swift	69.230% <100.000%> (ø)
Sources/Sentry/SentryTracer.m	96.736% <100.000%> (+0.015%)	⬆️
.../SentryTests/Helper/SentrySerializationTests.swift	98.461% <100.000%> (ø)
...Network/SentryNetworkTrackerIntegrationTests.swift	69.354% <100.000%> (ø)
...erformance/Network/SentryNetworkTrackerTests.swift	98.452% <100.000%> (ø)
...sts/SentryTests/Protocol/SentryEnvelopeTests.swift	95.528% <100.000%> (ø)
Tests/SentryTests/SentryClientTests.swift	97.566% <100.000%> (ø)
Tests/SentryTests/SentrySDKTests.swift	96.762% <100.000%> (ø)
...s/SentryTests/Transaction/SentryBaggageTests.swift	100.000% <100.000%> (ø)
...ests/SentryTests/Transaction/SentrySpanTests.swift	100.000% <100.000%> (ø)
... and 2 more

... and 3 files with indirect coverage changes

---

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[brustolin]

LGTM

[philipphofmann]

@denrase and @brustolin, what's stopping us from merging this?

[denrase]

@philipphofmann Need to take another look if the failing CI is just flaky again or if it has to do with this PR.

[philipphofmann]

@philipphofmann Need to take another look if the failing CI is just flaky again or if it has to do with this PR.

@denrase, please merge main back into this branch. I fixed many flaky tests last week. That could fix your problems.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1213.23 ms	1230.83 ms	17.60 ms
Size	21.58 KiB	706.17 KiB	684.59 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
ae1fe61	1231.81 ms	1252.76 ms	20.95 ms
32ac934	1238.86 ms	1243.37 ms	4.52 ms
98a8c16	1234.69 ms	1265.02 ms	30.33 ms
5f8ee7a	1253.96 ms	1264.98 ms	11.02 ms
01a28a9	1225.55 ms	1249.96 ms	24.41 ms
31208ed	1217.45 ms	1246.69 ms	29.24 ms
2719ce6	1211.75 ms	1237.16 ms	25.41 ms
297f460	1234.81 ms	1255.27 ms	20.45 ms
881a955	1230.98 ms	1246.22 ms	15.24 ms
84fb4d9	1237.76 ms	1255.46 ms	17.70 ms

App size

Revision	Plain	With Sentry	Diff
ae1fe61	21.58 KiB	698.91 KiB	677.33 KiB
32ac934	21.58 KiB	616.72 KiB	595.14 KiB
98a8c16	20.76 KiB	431.00 KiB	410.24 KiB
5f8ee7a	22.85 KiB	411.93 KiB	389.08 KiB
01a28a9	22.85 KiB	405.39 KiB	382.55 KiB
31208ed	20.76 KiB	435.26 KiB	414.50 KiB
2719ce6	20.76 KiB	435.13 KiB	414.37 KiB
297f460	21.58 KiB	629.83 KiB	608.24 KiB
881a955	22.85 KiB	407.63 KiB	384.79 KiB
84fb4d9	22.84 KiB	402.57 KiB	379.72 KiB

Previous results on branch: feat/expose-span-baggage

Startup times

Revision	Plain	With Sentry	Diff
dd1b7f2	1229.31 ms	1246.08 ms	16.78 ms

App size

Revision	Plain	With Sentry	Diff
dd1b7f2	21.58 KiB	706.17 KiB	684.59 KiB

[denrase]

@philipphofmann The files were not properly prepared to be public, everything should be fixed now and we can merge.