Add sample for Spring Boot 3 / Jakarta WebFlux

[adinauer]

#skip-changelog

📜 Description

Adds a new sample for Spring Boot 3 using WebFlux

💡 Motivation and Context

To showcase new features only available for newer versions of Spring Boot.

💚 How did you test it?

manually started it and hit it with requests

📝 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 2384db9

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	334.22 ms	380.40 ms	46.18 ms
Size	1.73 MiB	2.34 MiB	626.30 KiB

[codecov]

Codecov Report

Base: 80.42% // Head: 80.42% // No change to project coverage 👍

Coverage data is based on head (2384db9) compared to base (db5bd4e).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #2564   +/-   ##
=========================================
  Coverage     80.42%   80.42%           
  Complexity     4011     4011           
=========================================
  Files           329      329           
  Lines         15114    15114           
  Branches       1979     1979           
=========================================
  Hits          12156    12156           
  Misses         2179     2179           
  Partials        779      779           

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