signOut method
Signs a user out of all web and device sessions and reset their sign-in cookies.
User will have to sign in by authenticating again.
Request parameters:
userKey - Identifies the target user in the API request. The value can
be the user's primary email address, alias email address, or unique user
ID.
$fields - Selector specifying which fields to include in a partial
response.
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<void> signOut(
  core.String userKey, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'admin/directory/v1/users/' +
      commons.escapeVariable('$userKey') +
      '/signOut';
  await _requester.request(
    url_,
    'POST',
    queryParams: queryParams_,
    downloadOptions: null,
  );
}