buildSubcontextInitialActionWithSubActions
inline fun buildSubcontextInitialActionWithSubActions(block: MutableList<CombinedSubcontextInitialAction.SubAction>.() -> Unit): CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, Update>
Build CombinedSubcontextInitialAction with block and return callback, which appropriate for BehaviourContext builders with subcontextInitialAction argument