add new functions to export

src/index.ts

 import VizTool from "./components/VizTool.vue";
 import { saveNetworkAsJSON } from "./composables/utilities/UseSaveData";
-import { importNetworkFromFile, importNetworkFromURL } from "@metabohub/viz-core";
+import { importNetworkFromFile, importNetworkFromURL, importGraphesFromURL, importGraphesFromFile } from "@metabohub/viz-core";
 import type { Network, GraphStyleProperties } from "@metabohub/viz-core/dist/types/index";
 
-export { VizTool, saveNetworkAsJSON, importNetworkFromFile, importNetworkFromURL, Network, GraphStyleProperties };
+export { VizTool, saveNetworkAsJSON, importNetworkFromFile, importNetworkFromURL, Network, GraphStyleProperties, importGraphesFromURL, importGraphesFromFile };
\ No newline at end of file