logout method
Implementation
Future<LogoutResponse> logout() async {
  final response = await _api.post('${Endpoints.kCore}$_kApiPostLogout');
  return logoutResponseFromJson(jsonEncode(response));
}
Future<LogoutResponse> logout() async {
  final response = await _api.post('${Endpoints.kCore}$_kApiPostLogout');
  return logoutResponseFromJson(jsonEncode(response));
}