[FEATURE] Add a json model for IP Discover

[dust63]

When we call the rest api route ocsapi/v1/ipdiscover/{network} the api Controller return an array instead of json object.
It's not very clean and can be hard to follow model update.

Can you convert it to a JSON object like you do for computers route:

{
"ip":"192.168.1.1"
"mac_address":"01:02:03:04:05:06"
....
}