[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 add to every memstore a Checkpoint/Restore, to be used by raft in Transct() operations, to be able to quickly restore memstore back at the start of a transaction, should an err occur, without the need of complex revert operations.