POTEL 69 - Hold a strong reference to OpenTelemetry span if created via Sentry API

[adinauer]

📜 Description

Hold a strong reference to OpenTelemetry span if created via Sentry API.

We now use OtelStrongRefSpanWrapper and hand it back to users creating a transaction via Sentry.startTransaction or start a child span. This holds a strong reference to the underlying OpenTelemetry span, keeping it form being garbage collected.

💡 Motivation and Context

Fixes #3993

💚 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 889b1d8

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	394.89 ms	484.61 ms	89.72 ms
Size	1.65 MiB	2.31 MiB	677.12 KiB

Previous results on branch: feat/otel-span-strongref

Startup times

Revision	Plain	With Sentry	Diff
b387fed	417.02 ms	519.06 ms	102.04 ms
33c9aac	393.47 ms	407.26 ms	13.79 ms
c658b5a	410.55 ms	461.18 ms	50.63 ms
2aabf9e	417.48 ms	530.78 ms	113.30 ms

App size

Revision	Plain	With Sentry	Diff
b387fed	1.65 MiB	2.31 MiB	677.07 KiB
33c9aac	1.65 MiB	2.31 MiB	677.05 KiB
c658b5a	1.65 MiB	2.31 MiB	677.05 KiB
2aabf9e	1.65 MiB	2.31 MiB	677.05 KiB

[lbloder]

LGTM 👍