Added placeholder for lastName and role addition functionality

Try to rebase

frontend/pweb/lib/models/role_draft.dart

@@ -0,0 +1,9 @@
+class RoleDraft {
+  final String name;
+  final String description;
+
+  const RoleDraft({
+    required this.name,
+    required this.description,
+  });
+}