/// <summary>
/// Runs message processor
/// </summary>
/// <param name="watcher">Queue watcher</param>
/// <param name="handler">Notification handler</param>
/// <returns>async task</returns>
public static async Task Run(QueueWatcher watcher, NotificationHandler handler)
{
// Only process one single item, then conclude
await watcher.ProcessNext(handler.Process);
}