Centralize attribute strings in consts and rename "editor:layer" to "editor:layer_path" (#4076)

* Rename "editor:layer" to "editor:layer_path" and centralize it in a const

* Centralize "editor:merged_layers" in a const

* Centralize all other attributes in consts

* Rename consts with ATTR_ prefix

* Format

node-graph/nodes/text/src/json.rs

@@ -1,5 +1,5 @@
-use core_types::Ctx;
 use core_types::table::{Table, TableRow};
+use core_types::{ATTR_TYPE, Ctx};
 use serde_json::Value;
 
 use crate::unescape_string;
@@ -248,7 +248,10 @@ fn query_json_all(
 	let mut results = Vec::new();
 	resolve_all(&value, &segments, !unquote_strings, &mut results);
 
-	results.into_iter().map(|(text, ty)| TableRow::new_from_element(text).with_attribute("type", ty.to_string())).collect()
+	results
+		.into_iter()
+		.map(|(text, ty)| TableRow::new_from_element(text).with_attribute(ATTR_TYPE, ty.to_string()))
+		.collect()
 }
 
 /// A parsed segment of a JSON access path.