Allow devices to broadcast available routes

[b-rowan]

Is your feature request related to a problem? Please describe.
Right now, network routes can only be set up on the server side. The way I am using this is with a lot of network aware devices, and I would like to be able to have the devices just broadcast that they have a certain network available to them.

Describe the solution you'd like
I think this would be best set up similar to tailscale, where the device can advertise routes, and then they must be approved on the server side.

Describe alternatives you've considered
The closest thing I can think of is to have the devices call into the remote server API, but with distributed systems this seems a bit less secure.