Re-added UGUI package

Packages/manifest.json

     "com.unity.ide.visualstudio": "2.0.3",
     "com.unity.ide.vscode": "1.2.2",
     "com.unity.inputsystem": "1.0.0",
+    "com.unity.ugui": "1.0.0",
     "com.unity.xr.arcore": "4.1.0-preview.10",
     "com.unity.xr.arfoundation": "4.1.0-preview.10",
     "com.unity.xr.arkit": "4.1.0-preview.10",