fix(listDocs,destroyStore): use trampoline in lieu of recursion to prevent callstack overflow

[TillaTheHun0]

Closes #30

This PR removes the recursion that was being used to power things like listDocs and deleting all keys on destroyStore and replaces it with a trampoline. This will allow those calls to succeed, for larger datasets, that would otherwise fail due to deep recursion.

This PR also exposes hashSlot which enables backwards compatibility with version 2 of the adapter, which does not use hash slots when creating keys. With hashSlot disabled, multi-key operations that can span multiple hashSlots will instead be performed individually to prevent CROSSSLOT errors like seen in #16 . Additional unit tests are implemented to ensure both hashSlot and no hashSlot works.