[lib] Narrow TraditionalRelationshipRequest to exclude 'farcaster' action

Summary:
Narrow TraditionalRelationshipRequest to exclude 'farcaster' action and make necessary changes across native/web client.

Will update validators/keyserver in subsequent diffs.

Depends on D11607

Test Plan: flow + validators will be tested in subsequent diffs.

Reviewers: ginsu, tomek, will, varun

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D11609