scanIdBook function
A function for scanning an ID Book.
Returns the scanned RsaIdBook or null if nothing was scanned.
Implementation
Future<RsaIdBook> scanIdBook(BuildContext context) async {
final scannedIdBook = await Navigator.of(context).push(MaterialPageRoute(
builder: (context) => RsaIdBookScanner(),
));
return scannedIdBook;
}