Function
delete-many
Delete the key-value pairs associated with the keys in the store.
Note that the key-value pairs are not guaranteed to be deleted in the order they are provided.
If any of the keys do not exist in the store, it skips the key.
If any other error occurs, it returns an err(error). When an error occurs, it does not
rollback the key-value pairs that were already deleted. Thus, this batch operation does not
guarantee atomicity, implying that some key-value pairs could be deleted while others might
fail.
Other concurrent operations may also be able to see the partial results.