Add the "memoize" attribute to the node macro (#4065)

* Add memoization attribute to node macro

* Fix memoization insertion for networks without conversion nodes

editor/src/messages/portfolio/document/node_graph/document_node_definitions/document_node_derive.rs

@@ -36,6 +36,7 @@ pub(super) fn post_process_nodes(custom: Vec<DocumentNodeDefinition>) -> HashMap
 			description,
 			properties,
 			context_features,
+			memoize: _,
 		} = metadata;
 
 		let Some(implementations) = &node_registry.get(id) else { continue };