CoordinatorWithOffsets sets up a Coordinator with a single inmemory module defined.

Coordinator (storage) manages a single storage module (only one module is supported at this time), making sure it is configured, started, and stopped at the appropriate time.

InMemoryStorage is a storage module that maintains the entire data set in memory in a series of maps.

Module (storage) is responsible for maintaining all the broker and consumer offsets for all clusters that Burrow watches.