Handle the relying party notifications when the app is in background

[phoebus-84]

Right now the verification process works only when the app is in foreground. When the app is in background the device recieves a push notification with title: DIDroom Verifier, body: "A credential verification is ongoing". But when user click on the notification the app will open at the wrong view. We should implement the right routing for the notification, send a more meaningful message (translated, with the session id etc) and land the user to the last step of the verification process.