Add hook for subscribing to local peers

[achou11]

We have an implementation that currently lives in mobile here:

https://github.com/digidem/comapeo-mobile/blob/35a2e4f102a762bdbfed3be1f8ea633220dcad24/src/frontend/hooks/useLocalPeers.ts

Ideally should live here to be usable from desktop as well.

[achou11]

Worth noting that we have a specialized hook in mobile that wraps the useLocalPeer() that's more specific to application UX needs here:

https://github.com/digidem/comapeo-mobile/blob/35a2e4f102a762bdbfed3be1f8ea633220dcad24/src/frontend/screens/Settings/ProjectSettings/YourTeam/SelectDevice.tsx#L121

Might be useful to implement this but personally think it'd be okay to leave that to the consuming application to implement.