device group (#10781)

1. Rename `Group` tab to `Accessible devices`
2. Add accessible device groups at the top of search list
3. option `preset-device-group-name` and command line `--assign --device_group_name`

Signed-off-by: 21pages <sunboeasy@gmail.com>

flutter/lib/desktop/pages/connection_page.dart

@@ -350,6 +350,7 @@ class _ConnectionPageState extends State<ConnectionPage>
                         rdpPort: '',
                         rdpUsername: '',
                         loginName: '',
+                        device_group_name: '',
                       );
                       _autocompleteOpts = [emptyPeer];
                     } else {