@SmithyInternalApi
    public static Function<FunctionNode, Optional<LibraryFunction>> createFunctionFactory() {
        return LazyEndpointComponentFactoryHolder.INSTANCE.createFunctionFactory();
    }
Creates a {@link LibraryFunction} factory function using the loaded function definitions.

@return the created factory.
smithy-rules-engine/src/main/java/software/amazon/smithy/rulesengine/language/EndpointRuleSet.java