MODE-2323 Removed the proxy layer and delta write functionality in Schematic

ModeShape's is no longer using Infinispan in ways where these pieces of functionality are useful.
Removing them should simplify the logic to represent more of what we're actually doing. See MODE-2323 for details.
if this logic is removes, it means we're always locking preemptively, regardless whether the configuration option is `OPTIMISTIC` or `PESSIMISTIC`. Do we want this ?