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.
Infinispan actually throws an exception (and we propagate the error) if you manually lock and the cache is not `PESSIMISTIC`, so since we're manually locking the ISPN cache cannot be `PESSIMISTIC`.