graphql: Add a method to list groups

app/queries/get_user_details.graphql

@@ -7,7 +7,7 @@ query GetUserDetails($id: String!) {
     lastName
     creationDate
     groups {
-      id
+      displayName
     }
   }
 }

app/src/components/user_details.rs

@@ -219,7 +219,7 @@ impl Component for UserDetails {
             html! {
               <tr>
                 <td><button>{"-"}</button></td>
-                <td>{&group.id}</td>
+                <td>{&group.display_name}</td>
               </tr>
             }
         };