kvserver: DistSender lease detection prototype #105507
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When a DistSender request has been running for some time without a response, asynchronously scan the range replicas for a different leaseholder. If found, cancel the in-flight request and retry it on a different replica.
Combined with expiration-based leases, this successfully recovers from disk stalls, replica deadlocks, and partial network partitions in less than 10 seconds.
Touches #105168.