Add webcam qr code scanning on Faucet UI

[PierreBesson]

During the session @chevdor did today on wallet setup for non technical people, it would have been nice to be able to fund mobile wallet accounts by scanning your account qrcode with the camera.

[PierreBesson]

A good implementation of this is in the subwallet web app under "attach an account". It is very easy to add an account from nova wallet or similar mobile apps.
https://web.subwallet.app/
https://web.subwallet.app/accounts/attach-read-only