This lets us use the group id as the key for an `ElementState`, which fixes a panic that would occur in project diagnostics when opening it while there were multiple diagnostic groups with the same id.
Zed Server
This crate is what we run at https://collab.zed.dev.
It contains our back-end logic for collaboration, to which we connect from the Zed client via a websocket after authenticating via https://zed.dev, which is a separate repo running on Vercel.