Implement ThreadLocalAccessor for propagating Sentry hub with reactor / WebFlux

[adinauer]

📜 Description

Implement ThreadLocalAccessor for propagating Sentry hub with reactor / WebFlux

💡 Motivation and Context

To automatically have the correct thread local hub without requiring explicit user code.

💚 How did you test it?

📝 Checklist

• 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 e132c76

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	328.25 ms	333.70 ms	5.45 ms
Size	1.73 MiB	2.34 MiB	626.22 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
db5bd4e	286.94 ms	315.26 ms	28.32 ms
db5bd4e	352.90 ms	359.52 ms	6.62 ms
db5bd4e	314.82 ms	349.17 ms	34.35 ms
d691d8f	352.56 ms	389.59 ms	37.03 ms
db5bd4e	347.00 ms	366.74 ms	19.74 ms

App size

Revision	Plain	With Sentry	Diff
db5bd4e	1.73 MiB	2.34 MiB	626.30 KiB
db5bd4e	1.73 MiB	2.34 MiB	626.30 KiB
db5bd4e	1.73 MiB	2.34 MiB	626.30 KiB
d691d8f	1.73 MiB	2.34 MiB	626.23 KiB
db5bd4e	1.73 MiB	2.34 MiB	626.30 KiB

Previous results on branch: feat/support-thread-local-accessor-for-reactor

Startup times

Revision	Plain	With Sentry	Diff
05b9e20	343.67 ms	366.00 ms	22.33 ms
b3f3d7a	336.37 ms	387.04 ms	50.67 ms
14b93a6	305.29 ms	334.71 ms	29.43 ms
faa16e4	329.80 ms	384.18 ms	54.38 ms
7620651	325.24 ms	359.59 ms	34.35 ms

App size

Revision	Plain	With Sentry	Diff
05b9e20	1.73 MiB	2.34 MiB	626.30 KiB
b3f3d7a	1.73 MiB	2.34 MiB	626.30 KiB
14b93a6	1.73 MiB	2.34 MiB	626.30 KiB
faa16e4	1.73 MiB	2.34 MiB	626.22 KiB
7620651	1.73 MiB	2.34 MiB	626.30 KiB

[codecov]

Codecov Report

Patch coverage: 76.11% and project coverage change: -0.03 ⚠️

Comparison is base (d691d8f) 80.42% compared to head (ea3be7d) 80.40%.

❗ Current head ea3be7d differs from pull request most recent head e132c76. Consider uploading reports for the commit e132c76 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2570      +/-   ##
============================================
- Coverage     80.42%   80.40%   -0.03%     
- Complexity     4006     4017      +11     
============================================
  Files           329      332       +3     
  Lines         15111    15160      +49     
  Branches       1978     1979       +1     
============================================
+ Hits          12153    12189      +36     
- Misses         2179     2191      +12     
- Partials        779      780       +1     

Impacted Files	Coverage Δ
...ebflux/SentryWebFilterWithThreadLocalAccessor.java	0.00% <0.00%> (ø)
sentry/src/main/java/io/sentry/Sentry.java	55.20% <0.00%> (-0.88%)	⬇️
...io/sentry/spring/jakarta/webflux/ReactorUtils.java	61.53% <61.53%> (ø)
...g/boot/jakarta/SentryWebfluxAutoConfiguration.java	85.71% <83.33%> (+19.04%)	⬆️
...o/sentry/spring/boot/jakarta/SentryProperties.java	77.77% <88.88%> (+3.70%)	⬆️
...ing/jakarta/webflux/SentryWebExceptionHandler.java	90.90% <89.47%> (-3.21%)	⬇️
...arta/webflux/SentryReactorThreadLocalAccessor.java	100.00% <100.00%> (ø)
...sentry/spring/jakarta/webflux/SentryWebFilter.java	95.45% <100.00%> (+0.21%)	⬆️

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