farseer: Another kind of Farcaster hub

farseer is a lightweight re-implementation of a Farcaster hub that does not require syncing to operate and can be extended through plugins. Users can bring their own database, logic and infrastructure to harvest protocol data. The project offers a Docker setup that starts the hub with default behavior and plugins, or a manual route that requires Go 1.22+ to compile the binary and plugins. Configuration is handled through a config.toml file, which sets the public IP, gossip port, bootstrap peers, and per-plugin options such as the PostgreSQL plugin's database address, allowed message types and tracked FIDs. Plugins export a Handler struct with functions for message types such as cast adds and reaction adds.