code: public Observable<Page<BuildArgumentInner>> listBuildArgumentsAsync(final String resourceGroupName, final String registryName, final String buildTaskName, final String stepName) {
          return listBuildArgumentsWithServiceResponseAsync(resourceGroupName, registryName, buildTaskName, stepName)
              .map(new Func1<ServiceResponse<Page<BuildArgumentInner>>, Page<BuildArgumentInner>>() {
                  @Override
                  public Page<BuildArgumentInner> call(ServiceResponse<Page<BuildArgumentInner>> response) {
                      return response.body();
                  }
              });
      }
docs: List the build arguments for a step including the secret arguments.
  
  @param resourceGroupName The name of the resource group to which the container registry belongs.
  @param registryName The name of the container registry.
  @param buildTaskName The name of the container registry build task.
  @param stepName The name of a build step for a container registry build task.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;BuildArgumentInner&gt; object