RavenDB-3023 Refactoring
RavenDB-3023 Proper calculation of MapStoragePerformance.StorageCommitDurationMs - takes into account different accessor instances created on demand by different threads
RavenDB-3023 There is no need to override equals and getHashCode methods.
RavenDB-3023 Fixing calculation of WaitingTimeSinceLastBatchCompleted - note that map/reduce batches go to the same collection.