Code cleanup and refactoring to enhance consistency (#1695)

- Move message handler payload data into structs
- Organize the file structure used by `editor/src/messages/portfolio/document` `/node_graph` and `/graph_operation`
- Make derive attributes use `serde::Serialize, serde::Deserialize` consistently instead of `use serde::{Deserialize, Serialize};` imports
- Various other code cleanup and refactoring

node-graph/wgpu-executor/src/executor.rs

@@ -180,6 +180,7 @@ async fn execute_shader<I: Pod + Send + Sync, O: Pod + Send + Sync>(device: Arc<
 // #[cfg(test)]
 // mod test {
 // 	use super::*;
+//
 // 	use graph_craft::concrete;
 // 	use graph_craft::generic;
 // 	use graph_craft::proto::*;