doInNewSubContext
suspend fun <T, BC : BehaviourContext> BC.doInNewSubContext(scope: CoroutineScope = LinkedSupervisorScope(), triggersHolder: TriggersHolder = this.triggersHolder, updatesUpstreamFlow: Flow<Update> = allUpdatesFlow, subcontextInitialAction: CustomBehaviourContextAndTypeReceiver<BC, Unit, Update> = this.subcontextInitialAction, behaviourContextReceiver: CustomBehaviourContextReceiver<BC, T>): T
Launch behaviourContextReceiver in context of this as BehaviourContext and as CoroutineContext
this will NOT be closed automatically