feat: rewrite library state management & related refactor (#5067)

* support libraryItems promise for `updateScene()` and use `importLibrary`

* fix typing for `getLibraryItemsFromStorage()`

* remove `libraryItemsFromStorage` hack

if there was a point to it then I'm missing it, but this part will be rewritten anyway

* rewrite state handling

(temporarily removed loading states)

* add async support

* refactor and deduplicate library importing logic

* hide hints when library open

* fix snaps

* support promise in `initialData.libraryItems`

* add default to params instead

src/types.ts

@@ -209,13 +209,25 @@ export type ExcalidrawAPIRefValue =
       ready?: false;
     };
 
+export type ExcalidrawInitialDataState = Merge<
+  ImportedDataState,
+  {
+    libraryItems?:
+      | Required<ImportedDataState>["libraryItems"]
+      | Promise<Required<ImportedDataState>["libraryItems"]>;
+  }
+>;
+
 export interface ExcalidrawProps {
   onChange?: (
     elements: readonly ExcalidrawElement[],
     appState: AppState,
     files: BinaryFiles,
   ) => void;
-  initialData?: ImportedDataState | null | Promise<ImportedDataState | null>;
+  initialData?:
+    | ExcalidrawInitialDataState
+    | null
+    | Promise<ExcalidrawInitialDataState | null>;
   excalidrawRef?: ForwardRef<ExcalidrawAPIRefValue>;
   onCollabButtonClick?: () => void;
   isCollaborating?: boolean;