Add a DropAll method in ManagedDB #525
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This method drops all tables from the LSM tree, except one to maintain the persistence of
badgerHeadkey. This is important to avoid value log being replayed from scratch.It then iterates over the rest of the keys and marks them as deleted. The end result should be that all keys are considered deleted.
NOTE to users: The timestamp used for writes must be greater than the max timestamp of writes before DropAll, to ensure that new writes are not lower than the delete markers in terms of versioning.
This change is