feat: create funnel-builder extension

Author: adrians5j

extensions/funnel-builder/extension.json

@@ -11,5 +11,11 @@
     "component": {
       "name": "FunnelBuilder"
     }
+  },
+  "packageJson": {
+    "dependencies": {
+      "@dnd-kit/core": "^6.3.1",
+      "@dnd-kit/sortable": "^10.0.0"
+    }
   }
 }