docs: public Observable<Page<StorageAccountInner>> listByResourceGroupAsync(String resourceGroupName) {
          return listByResourceGroupWithServiceResponseAsync(resourceGroupName).map(new Func1<ServiceResponse<List<StorageAccountInner>>, Page<StorageAccountInner>>() {
              @Override
              public Page<StorageAccountInner> call(ServiceResponse<List<StorageAccountInner>> response) {
                  PageImpl<StorageAccountInner> page = new PageImpl<>();
                  page.setItems(response.body());
                  return page;
              }
          });
      }