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kvserver: introduce a Raft-based transport for closedts
This patch introduces a replacement for the existing closed timestamp mechanism / transport. The new mechanism is gated by a cluster version. Raft commands now carry increasing closed timestamps generated by the propBuf by using the recent request Tracker for synchronizing with in-flight requests (i.e. not closing timestamps below them). Raft commands get a closed ts field, and the range state gets the field as well. The propBuf pays attention to the range's closed timestamp policy for deciding whether to close lagging or leading timestamps. Fixes cockroachdb#57395, cockroachdb#57396 Touches cockroachdb#57405 Release note: None
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