Ensure streamed span names have low-cardinality span names

For v11, streamed span names should become low-cardinality. Since we'll still support transactions as a fallback, we'll need to check for `traceLifecycle` and assign different span names for `stream` or `static` mode.

Span name rules are defined here: [https://getsentry.github.io/sentry-conventions/names/]()

This is a large(r) task but should be splittable so that we can tackle it in parallel

lower prio but to address:

- function spans
- ui/component spans