DHCP: scan network

[andre8244]

Expose the same feature present on NS7:

the user should be able to execute an arp scan to a given network device

the UI should list all devices found; if a device does not have a reservation, display also a button to create the reservation

Mockups (Network section, marked as Ready in blue)

NS7 screenshot:

[github-actions[bot]]

Testing image version: 8-23.05.3-ns.0.0.3-rc1-78-g2869418

[gsanchietti]

Verified.