Derive from this interface to implement a factory to return a backend type. An instance of the factory should be created and then registered toIModularFeatureswith the feature name "VirtualizationBackendFactory" to give 'FVirtualizationManager' access to it. The macro 'UE_REGISTER_VIRTUALIZATION_BACKEND_FACTORY' can be used to create a factory easily if you do not want to specialize the behavior.