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/interpreted-executor/src/dynamic_executor.rs

@@ -227,10 +227,10 @@ impl BorrowTree {
 
 #[cfg(test)]
 mod test {
-	use graph_craft::document::value::TaggedValue;
-
 	use super::*;
 
+	use graph_craft::document::value::TaggedValue;
+
 	#[test]
 	fn push_node_sync() {
 		let mut tree = BorrowTree::default();

node-graph/interpreted-executor/src/lib.rs

@@ -11,7 +11,6 @@ mod tests {
 	#[test]
 	fn execute_add() {
 		use graph_craft::document::*;
-
 		use graph_craft::*;
 
 		fn add_network() -> NodeNetwork {
@@ -82,7 +81,6 @@ mod tests {
 	#[test]
 	fn double_number() {
 		use graph_craft::document::*;
-
 		use graph_craft::*;
 
 		let network = NodeNetwork {