[persist] Dynamic lease timeouts #21822
Merged
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Motivation
This is a long-time known-useful knob which has recently become more urgent.
Closes MaterializeInc/database-issues#6546
Tips for reviewer
I have not yet tested that all the wiring is set up correctly; will comment when that's done.
Checklist
$T ⇔ Proto$T
mapping (possibly in a backwards-incompatible way), then it is tagged with aT-proto
label.