Implement reverseScan #711
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I need a
reverseScanso I implemented it.This PR added
scanmethods with aboolean reverseargument, and also a seperatereverseScanmethod.I exchanges the position of startKey and endKey before creating the iterator, because you did so in the rust client. I'm assuming startKey means strictly the lower bound and so does endKey.
Since there are no test cases for the behavior of
scanin this repo, unit tests forreverseScanare also not written.