[native] introduce farcaster account settings profile row

Summary:
this diff introduces a barebones FarcasterAccountSettings screen + all the navigational logic to get to this screen from the profiles screen. Too make this diff easier to review, subsequent diffs will handle extending FarcasterAccountSettings.

Depends on D11463

Test Plan:
Please see the demo video below + tested the entire sign in + unauth flow during the hackathon

Reviewers: atul

Reviewed By: atul

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D11483