Replace node definition string-based lookups with DefinitionIdentifier instances (#3451)

* create definition identifier and integrate it

* Bug fixes and code review

* formatting

* Fix migrations

* Fix remove handles migration

* formatting

* Fix test

* Fix tests 2

* fix deserialization

* Code review

* Small fixes

* Consolidate 'Morph' node migrations

* Add old SamplePointsNode name to migrations list

* Fix tests

* Unrelated small fix

* Fix migration crashes

* Fix tests

* Final code review

* fmt

* Add metadata

---------

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

frontend/src/state-providers/node-graph.ts

@@ -9,6 +9,7 @@ import {
 	type FrontendNode,
 	type FrontendNodeType,
 	type WirePath,
+	type DefinitionIdentifier,
 	ClearAllNodeGraphWires,
 	SendUIMetadata,
 	UpdateBox,
@@ -44,7 +45,7 @@ export function createNodeGraphState(editor: Editor) {
 		/// The index is the exposed input index. The exports have a first key value of u32::MAX.
 		wires: new Map<bigint, Map<number, WirePath>>(),
 		wirePathInProgress: undefined as WirePath | undefined,
-		nodeDescriptions: new Map<string, string>(),
+		nodeDescriptions: new Map<DefinitionIdentifier, string>(),
 		nodeTypes: [] as FrontendNodeType[],
 		thumbnails: new Map<bigint, string>(),
 		selected: [] as bigint[],