[raft/memstore] Add Checkpoint/Restore - #1539
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This PR is part of a new chain, implementing memstore.
#1525 (Generic raftstore) -> #1527 (Base memstore) -> #1529 (Aux memstore) -> #1530 (Snapshots) -> #1534 (Rid memstore) -> #1535 (Correct use of now) -> #1539 (Checkpoint) -> #1542 (Scd memstore) -> #1528 (First PR with raft using memstore)
It adds a Checkpoint/Restore to every memstore, to be used by raft in
Transact()operations, allowing it to quickly restore the memstore back to the start of a transaction should an error occur, without the need for complex revert operations.