[lib] Update FarcasterDataHandler to construct FarcasterRelationshipRequest with userIDsToFID
Summary:
We're updating FarcasterDataHandler to construct userIDsToFID map which will be passed to the keyserver. We include userIDs and fids for both the "target users" as well as current user.
NOTE: The request constructed on the client will currently fail. We need to update both validators and responder on keyserver to support this new format.
Depends on D11605
Test Plan:
Add log statements to userIDsToFID, userIDsToFIDIncludingCurrentUser, and createThreadsAndRobotextForFarcasterMutuals and ensure that data is structured as expected.
(made some tweaks to the code here, so will go through again before landing)
Reviewers: ginsu, varun, will, tomek
Reviewed By: ginsu, tomek
Subscribers: ashoat
Differential Revision: https://phab.comm.dev/D11606