Firebase 익명 로그인 구현

public void SignInAnonymously()
    {
        auth.SignInAnonymouslyAsync().ContinueWith(task => {
            if (task.IsCanceled)
            {
                Debug.LogError("SignInAnonymouslyAsync was canceled.");
                return;
            }
            if (task.IsFaulted)
            {
                Debug.LogError("SignInAnonymouslyAsync encountered an error: " + task.Exception);
                return;
            }
            user = task.Result;
            onSignInSuccess?.Invoke(user);
        });
    }