[lib][native][web] Introduce useSecondaryDeviceLogIn

Summary:
This diff does two things:

1. Factors out shared logic around secondary device login on web and native
2. Makes sure we perform authoritative keyserver auth as part of that. This mostly addresses ENG-8123

Depends on D12113

Test Plan: I tested the flow using staging, with my phone as a primary device and a local simulator as a secondary device

Reviewers: bartek, tomek

Reviewed By: bartek

Differential Revision: https://phab.comm.dev/D12114