refactor(cli): move op sanitizer to Rust

[mmastrac]

The format of the sanitizers will change a little bit:

• If multiple async ops leak and traces are on, we repeat the async op header once per stack trace.
• All leaks are aggregated under a "Leaks detected:" banner as the new timers are eventually going to be added, and these are neither ops nor resources.
• 1 async op is now An async op
• If ops and resources leak, we show both (rather than op leaks masking resources)

Follow-on to #22226

[dsherret]

Great!