[native] introduce barebones keyserver selection list screen

Summary:
This diff introduces the barebones keyserver selection list screen and all the navigation logic to navigate from the profile screen to this new screen

Linear Task: https://linear.app/comm/issue/ENG-4911/introduce-keyserver-selection-screen-into-our-profile-app-navigation

Depends on D9565

Test Plan:
Please see the demo video below

Reviewers: rohan, inka, michal

Reviewed By: rohan

Subscribers: ashoat, tomek, wyilio

Differential Revision: https://phab.comm.dev/D9566