Generate a visualization of the editor's hierarchical message system tree (#2499)

* Feat: implement the hierarchical tree for visualization

* rename HierarchicalTree trait function

* feat: change the HierarchicalTree from String to DebugMessageTree struct

* Nits

* feat: impliment proc macro to extract field from messagedata structs

* update the hierarchical-tree for hanlder data

* feat: added message handler struct to hierarchical tree

* feat: add the line number to message handler struct

* feat: added handler path to tree and NITS

* clean the white spaces in type string

* fixes some white spaces

* feat: added path to message enum in hierarchical tree

* feat: add file creation of hierarchical message system tree

* cleanup

* Code review

* Add todo comment for deferred change

---------

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

editor/src/messages/layout/layout_message_handler.rs

@@ -6,7 +6,7 @@ use graphene_std::text::Font;
 use graphene_std::vector::style::{FillChoice, GradientStops};
 use serde_json::Value;
 
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone, Default, ExtractField)]
 pub struct LayoutMessageHandler {
 	layouts: [Layout; LayoutTarget::LayoutTargetLength as usize],
 }
@@ -342,6 +342,15 @@ impl LayoutMessageHandler {
 	}
 }
 
+pub fn custom_data() -> MessageData {
+	// TODO: When <https://github.com/dtolnay/proc-macro2/issues/503> is resolved and released,
+	// TODO: use <https://doc.rust-lang.org/stable/proc_macro/struct.Span.html#method.line> to get
+	// TODO: the line number instead of hardcoding it to the magic number on the following line.
+	// TODO: Also, utilize the line number in the actual output, since it is currently unused.
+	MessageData::new(String::from("Function"), vec![(String::from("Fn(&MessageDiscriminant) -> Option<KeysGroup>"), 350)], file!())
+}
+
+#[message_handler_data(CustomData)]
 impl<F: Fn(&MessageDiscriminant) -> Option<KeysGroup>> MessageHandler<LayoutMessage, F> for LayoutMessageHandler {
 	fn process_message(&mut self, message: LayoutMessage, responses: &mut std::collections::VecDeque<Message>, action_input_mapping: F) {
 		match message {