feat(svelte) added useNodes and useEdges hooks

packages/svelte/src/lib/hooks/useNodesEdges.ts

@@ -0,0 +1,11 @@
+import { useStore } from '$lib/store';
+
+export function useNodes() {
+  const { nodes } = useStore();
+  return nodes;
+}
+
+export function useEdges() {
+  const { edges } = useStore();
+  return edges;
+}