Optimize OrchestrationState persistence in commit log #94
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…pace in commit log
# Conflicts: # src/DurableTask.Netherite/PartitionState/InstanceState.cs
# Conflicts: # src/DurableTask.Netherite/PartitionState/SessionsState.cs
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Previously, the latest orchestration state was saved to the commit log on every workitem commit.
This is somewhat redundant, because almost all fields, meaning all fields except the custom status are already implied
by the event history.
Thus, in this PR the OrchestrationState is no longer persisted; instead, only the new events, and the new custom status (if there is one) are persisted, which is sufficient to reconstruct the OrchestrationState if it should be needed when recovering from the commit log.