static <C, T> @NonNull DefaultValueFactory<C, T> constant(final @NonNull DefaultValue<C, T> defaultValue) {
        return parameter -> defaultValue;
    }
Creates a default value factory that always returns the given {@code defaultValue}.

@param <C>          command sender type
@param <T>          type of the value
@param defaultValue default value instance
@return the created factory
cloud-annotations/src/main/java/org/incendo/cloud/annotations/DefaultValueFactory.java