Merge pull request #6 from praserx/feat/added-exists-and-delete-funct…

…ions

feat: added exists and delete functions

Merge pull request #5 from praserx/feat/preserve-ttl-on-update

feat: preserve ttl on update

Merge pull request #4 from praserx/v2

feat: minor fixes and improvements, enhanced readme, updated workflows

Github username changed (PraserX --> praserx)

Removed Btree, added lookup table instead

Btree config update, refactoring

Shard release and active shard indication fix

Back to BTree with some minor changes

BTree to hashmap

Mutex lib replaced by sync.mutex