adds copy and dump/restore methods #874
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this will close #862
Caveat is,
copyis a multi-key command, and when connecting to a Cluster it will throw aCROSSSLOTerror if the keys are resolved to different hashslots. This is by design and enforced by Redis. The expectation is, it is up to the user to take care when calling this method.Possible modification for the future is to return
F[Either[CrossSlotError,A]]to be explicit about the possibility of error in the return type