[native] Perform the backup restoration

Summary:
Restore the backup. When this operation finishes successfully, a user is navigated to the chat screen.

https://linear.app/comm/issue/ENG-9967/connect-the-siwe-logic-with-the-ui
https://linear.app/comm/issue/ENG-9966/connect-the-password-logic-with-the-ui

Depends on D14090

Test Plan: Go through the restore flow for both password and SIWE and check if the account was successfully restored.

Reviewers: kamil, angelika, bartek

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D14165