buildSubcontextInitialAction
inline fun buildSubcontextInitialAction(block: MutableList<CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, <Error class: unknown class>>>.() -> Unit): CustomBehaviourContextAndTypeReceiver<BehaviourContext, Unit, <Error class: unknown class>>
Build CombinedSubcontextInitialAction with block and return callback, which appropriate for BehaviourContext builders with subcontextInitialAction argument