async function start() {
    logger.info('Starting Telegram service');
    const token = await gladys.variable.getValue('TELEGRAM_API_KEY', serviceId);
    if (!token) {
      throw new ServiceNotConfiguredError('No telegram api token found. Not starting telegram service');
    }
    await messageHandler.connect(token);
  }
@public
@description This function starts the TelegramService.
@example
gladys.services.telegram.start();