get method
Retrieves an authentication key.
Implementation
@override
Future<String?> get() async {
  final cloudData = _cloudData;
  if (cloudData != null) {
    return cloudData.token;
  }
  _cloudData = await ResourceManager.tryFetchServerpodCloudAuthData(
    localStoragePath: _localStoragePath,
    logger: _logger,
  );
  return _cloudData?.token;
}