[native] implement QR Auth stack navigator

Summary:
ENG-9959.

1. Implement QRAuthNavigator, other screens in the QR Auth flow are going to be part of this.
2. Moved existing SecondaryDeviceQRCodeScanner to be part of QRAuthNavigator.

screenOptions in QRAuthNavigator are the same as in RegistrationComponent as we want those two flows to look consistent.

In ENG-9968 there is an example of how this looks like.

Test Plan: Test adding secondary device - should work exactly the same.

Reviewers: ashoat, tomek

Reviewed By: ashoat

Differential Revision: https://phab.comm.dev/D14100