[lib][native] Extract QR code to a spearate component

Summary:
To avoid code duplication between web and native, extracted most of the secondary device auth logic into a separate React component.

Depends on D11301

Test Plan: Flow, repeated test plan from parent diffs in this stack (basically repeated the QR auth flow).

Reviewers: kamil, michal

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11330