ar:// URI support

[Danziger]

Whitelisting a ar:// URI is technically possible too, but due to the way AR.IO Wayfinder works, Othent won't work properly.

While you can use your ar:// URI as auth0RedirectURI and auth0ReturnToURI, that won't currently work as expected because request made from your dApp will never originate from your ar:// domain, but from the gateway's domain AR.IO Wayfinder randomly picked.

Moreover, your dApp won't work for users using AR.IO Wayfinder if they are routed through a different non-whitelisted gateway.