%near-account agent

[hanfel-dovned]

Users of the %near Urbit app will be able to claim a .urbit account matching their @p. The backend here will need to call out to the relay server (#13) and then store account credentials.

This should probably just happen in on-init so that the user doesn't need to manually do anything, and so that we don't need to make a frontend for it.

As with #17, this should be its own Gall agent. Maybe call it %near-account.

[hanfel-dovned]

and then store account credentials

As well as serve them to frontend gateways that need them.