trash method
Moves the specified thread to the trash.
Any messages that belong to the thread are also moved to the trash.
Request parameters:
userId - The user's email address. The special value me can be used to
indicate the authenticated user.
id - The ID of the thread to Trash.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Thread.
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<Thread> trash(
  core.String userId,
  core.String id, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ = 'gmail/v1/users/' +
      commons.escapeVariable('$userId') +
      '/threads/' +
      commons.escapeVariable('$id') +
      '/trash';
  final response_ = await _requester.request(
    url_,
    'POST',
    queryParams: queryParams_,
  );
  return Thread.fromJson(response_ as core.Map<core.String, core.dynamic>);
}