[web] update ThreadAvatar component to pass farcaster channel ID to useResolvedThreadAvatar

Summary:
Depends on D13744

pass an object containing username/fid or an object containing a farcaster channel ID to useResolvedThreadAvatar

Test Plan: modified threads table in mariadb successfully set thread avatars for all threads in a tagged community to the fc channel image. was able to change child threads to other avatar types

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13745