Add MemoizeImpure node and cache image base64 in graph (#1595)

* Cache base64 representation of images when converting to graphic group

* Fix build

* Fix build again

* Actually fix it this time

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Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/messages/portfolio/document/node_graph/node_graph_message_handler/document_node_types.rs

@@ -1024,6 +1024,15 @@ fn static_nodes() -> Vec<DocumentNodeDefinition> {
 			manual_composition: Some(concrete!(())),
 			..Default::default()
 		},
+		DocumentNodeDefinition {
+			name: "MemoizeImpure",
+			category: "Structural",
+			implementation: NodeImplementation::proto("graphene_core::memo::ImpureMemoNode<_, _, _>"),
+			inputs: vec![DocumentInputType::value("Image", TaggedValue::ImageFrame(ImageFrame::empty()), true)],
+			outputs: vec![DocumentOutputType::new("Image", FrontendGraphDataType::Raster)],
+			manual_composition: Some(concrete!(Footprint)),
+			..Default::default()
+		},
 		DocumentNodeDefinition {
 			name: "Image",
 			category: "Ignore",