[iOS] Universal link not working as redirect URI

## Issue

Hi,

I am facing the problem that my https redirect URI is not working when using the normal authentication through the browser popup window. However, if I set the customBrowser to Safari, it works. This will open up the Safari browser in a external window. After swichting back to the popup window it works, but only for a limited time. After some time the Universal links stop working (Properly because the associated domains are cached somehow?). I have the feeling the apple app site association file is not loaded correctly, when the external browser is not opened once.

The use of the external (or default web browser) variant is not accepted by Apple App Review anymore, because of bad user experience.

If anyone could solve this problem, please contact me!

Thanks!
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## Environment
Keycloak
* **Platform that you're experiencing the issue on**: `iOS`
* **Your `react-native` Version**: `e.g. 0.72.1`
* **Your `react-native-app-auth` Version**: `e.g. 7.0.0`
* **Are you using Expo?**
no

Comienza reproduciendo el flujo de redirección HTTPS de Keycloak en react-native-app-auth en iOS, comparando la ventana emergente normal del navegador con Safari y comprobando el comportamiento de Universal Links y Apple App Site Association descrito en el issue. Se considera terminado cuando la redirect URI funciona de forma fiable desde la ventana emergente sin requerir un navegador externo; el informe no menciona ningún archivo ni prueba.

Escrito por el modelo de indexación a partir del texto del issue.