feat: create and expose serializeLibraryAsJSON (#5009)

Co-authored-by: David Luzar <luzar.david@gmail.com>

src/packages/utils.ts

@@ -139,6 +139,6 @@ export const exportToSvg = async ({
   );
 };
 
-export { serializeAsJSON } from "../data/json";
+export { serializeAsJSON, serializeLibraryAsJSON } from "../data/json";
 export { loadFromBlob, loadLibraryFromBlob } from "../data/blob";
 export { getFreeDrawSvgPath } from "../renderer/renderElement";