list method
Lists all environment groups.
Request parameters:
parent - Required. Name of the organization for which to list
environment groups in the following format: organizations/{org}.
Value must have pattern ^organizations/\[^/\]+$.
pageSize - Maximum number of environment groups to return. The page size
defaults to 25.
pageToken - Page token, returned from a previous ListEnvironmentGroups
call, that you can use to retrieve the next page.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a GoogleCloudApigeeV1ListEnvironmentGroupsResponse.
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<GoogleCloudApigeeV1ListEnvironmentGroupsResponse> 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') + '/envgroups';
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return GoogleCloudApigeeV1ListEnvironmentGroupsResponse.fromJson(
      response_ as core.Map<core.String, core.dynamic>);
}