[feature] add RPKI validity count

[digizeph]

each block will look like this:

{
    "IP": {
        "asn": "ASN",
        "ip": "IP",
        "num_connected_asns": 3,
        "num_v4_pfxs": 33,
        "num_v6_pfxs": 0,
        "rpki_valid_v4": 1,
        "rpki_invalid_v4": 1,
        "rpki_unknown_v4": 1,
        "rpki_valid_v6": 1,
        "rpki_invalid_v6": 1,
        "rpki_unknown_v6": 1
    }
}