Kafka Tracing: Robustness to lost or mis-aligned events

[sync-by-unito[bot]]

We need to make kafka tracing more robust to lost or mis-aligned events.

This includes:

• Hardening FindFrameBoundary, especially for responses, which need to have already matched with a request to have context on what the response is.

┆Issue is synchronized with this Jira Story by Unito