Pass OpenTelemetry span attributes into TracesSampler callback

[adinauer]

📜 Description

SamplingContext now has a getAttribute method granting access to OpenTelemetry span attributes when Sentry is used in OpenTelemetry mode.

💡 Motivation and Context

Fixes #4192

💚 How did you test it?

📝 Checklist

• 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.
• I updated the wizard 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 9c9c831

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	434.14 ms	465.71 ms	31.57 ms
Size	1.58 MiB	2.21 MiB	642.37 KiB

Previous results on branch: feat/access-to-otel-attributes-in-sampler

Startup times

Revision	Plain	With Sentry	Diff
0427eb9	422.63 ms	469.83 ms	47.21 ms

App size

Revision	Plain	With Sentry	Diff
0427eb9	1.58 MiB	2.21 MiB	642.37 KiB

[lcian]

Left some minor nits but LGTM.

We are calling it getAttribute which could possibly be an API we will have on Span as part of the attributes API that is in the works. As far as I understand this new concept of attributes will correspond to the OTEL one we are using here, so I agree on this naming.

Let's not forget to update the relevant docs: https://docs.sentry.io/platforms/java/guides/spring-boot/configuration/sampling/#setting-a-sampling-function