Server functions tracing

[nicohrubec]

Solution brainstorm: These go through the server entry point. So I think we can just start a span in our provided wrapper and attach any relevant meta data.

Tests: Need to add tests that server functinos are now reporting spans.

[linear]

JS-1196

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #18500, which was included in the 10.32.0 release.