list method
Lists attestors.
Returns INVALID_ARGUMENT if the project does not exist.
Request parameters:
parent - Required. The resource name of the project associated with the
attestors, in the format projects / * .
Value must have pattern ^projects/\[^/\]+$.
pageSize - Requested page size. The server may return fewer results than
requested. If unspecified, the server will pick an appropriate default.
pageToken - A token identifying a page of results the server should
return. Typically, this is the value of
ListAttestorsResponse.next_page_token returned from the previous call to
the ListAttestors method.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a ListAttestorsResponse.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<ListAttestorsResponse> list(
  core.String parent, {
  core.int? pageSize,
  core.String? pageToken,
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if (pageSize != null) 'pageSize': ['${pageSize}'],
    if (pageToken != null) 'pageToken': [pageToken],
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'v1/' + core.Uri.encodeFull('$parent') + '/attestors';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return ListAttestorsResponse.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}