Story #8167: Enable postgres replication between Coordinating Nodes
Document hazelcast components to be moved to postgres storage
Hazelcast is currently used to manage distributed data structures across the Coordinating Nodes.
The goal of this task is to document the structures that can be switched to direct postgres storage, the portions of code that need to be adjusted as a result of the change, and how change notification should be broadcast (e.g. should postgres triggers be used to notify of a change to system metadata or should the process changing system metadata be responsible for broadcasting notice of the change through rabbit MQ?).