Test individual monitor update compl in chanmon_consistency fuzzer #2820
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When looking at #2819 I initially assumed we may have a bug (rather than just an undocumented requirement that leads to bugs) and added some fuzzing features to surface it. To my surprise, they didn't surface any new bugs (at least in the two CPU-weeks I was able to give the changes here today), but are worth upstreaming.
When users do async monitor updating, it may not be the case that all pending monitors will complete updating at once. Thus, we should fuzz monitor updates completing out of order, which we do here.