unhandled
suspend fun <BC : BehaviourContext> BC.unhandledCommand(requireOnlyCommandInMessage: Boolean = true, initialFilter: CommonMessageFilter<TextContent>? = CommonMessageFilterExcludeMediaGroups, subcontextUpdatesFilter: CustomBehaviourContextAndTwoTypesReceiver<BC, Boolean, TextMessage, Update> = MessageFilterByChat, markerFactory: MarkerFactory<in TextMessage, Any> = ByChatMessageMarkerFactory, scenarioReceiver: CustomBehaviourContextAndTypeReceiver<BC, Unit, TextMessage>): Job