fix: Add monitoring information inside the function trace.

[dianakhuang]

Moved function_trace call to a higher level to capture more information about the overall inner loop of the consumer. Also renamed the function trace to consumer.consume so it's clearer from the outside what the span is doing.

Merge checklist: Check off if complete or not applicable:

• [x] Version bumped
• [x] Changelog record added
• [x] Documentation updated (not only docstrings)
• [x] Commits are squashed
• [ ] Noted any: Concerns, dependencies, deadlines, tickets, testing instructions