[native] unauth from farcaster

Summary:
This diff handles unauthing from farcaster. We handle unauthing from farcaster by removing the set fid from the farcaster provider. There is a task to handle updating this to replace all FIDProvider usages with synced metadata store tracked here: https://linear.app/comm/issue/ENG-7590/replace-all-fidprovider-usages-with-synced-metadata-store

cc @will

Depends on D11512

Test Plan: Confirmed that the fid is getting unset when onPressDisconnect is getting called

Reviewers: atul

Reviewed By: atul

Subscribers: will, ashoat, tomek

Differential Revision: https://phab.comm.dev/D11513