feat: support client attribution via onchain signers

[stephancill]

Signer attribution needs to be updated to support indexed on-chain signers.

This will require the database schema to be updated to support the latest replicator, this can be done using Prisma's db pull command. Each signer has a requester FID in its metadata, which points to the application that authorized the signer. This FID needs to be resolved after the signer is looked up in the /api/tweet/<id> API handler and the app's name needs to be passed in the client attribute of the response.