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9374ca3a - Add interactionStart and interactionEnd events (#931)

Add interactionStart and interactionEnd events (#931) * Add interactionStart and interactionEnd events These events are supported by all ClusterBehaviors and demarcate mutation interactions. Replaces MessageExchange closeCallback constructor parameter with "closed" event. * No new for AsyncObservable and Observable Works either way but CodeQL complains if it's inconsistent --------- Co-authored-by: Ingo Fischer <github@fischer-ka.de>