delete method
Deletes a creative.
Returns error code NOT_FOUND if the creative does not exist. The
creative should be archived first, i.e. set entity_status to
ENTITY_STATUS_ARCHIVED, before it can be deleted. A ["Standard" user
role](//support.google.com/displayvideo/answer/2723011) or greater for
the parent advertiser or partner is required to make this request.
Request parameters:
advertiserId - The ID of the advertiser this creative belongs to.
Value must have pattern ^\[^/\]+$.
creativeId - The ID of the creative to be deleted.
Value must have pattern ^\[^/\]+$.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Empty.
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<Empty> delete(
  core.String advertiserId,
  core.String creativeId, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v4/advertisers/' +
      core.Uri.encodeFull('$advertiserId') +
      '/creatives/' +
      core.Uri.encodeFull('$creativeId');
  final response_ = await _requester.request(
    url_,
    'DELETE',
    queryParams: queryParams_,
  );
  return Empty.fromJson(response_ as core.Map<core.String, core.dynamic>);
}