NewPersistentLease creates a new PersistentLease which starts immediately in the background.

WatchPrefix watches a prefix _forever_ until the provided context is cancelled.

PersistentLease is "persistent" lease in etcd.

Snapshot contains a "tree" at a given point in time.

KVTransform transforms a <Key, Value> pair from etcd into a <K, V> mapping suitable to the use-case of Snapshot[K, V].