feat: report the firewall's CARP addresses as virtual IPs

get_virtual_ips() reads every address bound to a CARP VHID -- the CARP
address and IP aliases on its VHID alike -- from
/api/interfaces/overview/export, with this node's CARP state, so the reading
says who holds each address. interfaces/vip_settings would list the same
addresses with each VHID's CARP password; it is not read.

vip_manager and keepalived are Linux mechanisms and are None here. Needs
napalm-device-types 4.10.0 (carp_virtual_ip).

netOrk #1121.

tests/unit/fixtures/interfaces_overview_carp.json

@@ -0,0 +1,62 @@
+[
+  {
+    "identifier": "lan",
+    "device": "em0",
+    "description": "MGMT",
+    "addr4": "192.0.2.2/24",
+    "ipv4": [
+      {"ipaddr": "192.0.2.2/24"},
+      {"ipaddr": "192.0.2.1/24", "vhid": "108", "status": "MASTER", "advbase": "1", "advskew": "0", "peer": "224.0.0.18", "peer6": "ff02::12"}
+    ],
+    "ipv6": [
+      {"ipaddr": "fe80::1:2/64"},
+      {"ipaddr": "2001:db8:8::1/64", "vhid": "108", "status": "MASTER", "advbase": "1", "advskew": "0", "peer": "224.0.0.18", "peer6": "ff02::12"}
+    ]
+  },
+  {
+    "identifier": "opt2",
+    "device": "vlan0040",
+    "description": "SERVER",
+    "addr4": "198.51.100.2/24",
+    "ipv4": [
+      {"ipaddr": "198.51.100.2/24"},
+      {"ipaddr": "198.51.100.140/32", "vhid": "140", "status": "MASTER", "advbase": "1", "advskew": "0", "peer": "224.0.0.18", "peer6": "ff02::12"},
+      {"ipaddr": "198.51.100.1/24", "vhid": "140", "status": "MASTER", "advbase": "1", "advskew": "0", "peer": "224.0.0.18", "peer6": "ff02::12"}
+    ]
+  },
+  {
+    "identifier": "opt9",
+    "device": "vlan0011",
+    "description": "",
+    "addr4": "203.0.113.2/24",
+    "ipv4": [
+      {"ipaddr": "203.0.113.2/24"},
+      {"ipaddr": "203.0.113.1/24", "vhid": "111", "status": "INIT", "advbase": "1", "advskew": "0", "peer": "224.0.0.18", "peer6": "ff02::12"}
+    ]
+  },
+  {
+    "identifier": "opt3",
+    "device": "vlan0020",
+    "description": "IOT",
+    "addr4": "192.0.2.130/25",
+    "ipv4": [
+      {"ipaddr": "192.0.2.130/25"},
+      {"ipaddr": "192.0.2.140/32"}
+    ]
+  },
+  {
+    "identifier": "lo0",
+    "device": "lo0",
+    "description": "Loopback",
+    "addr4": "127.0.0.1/8",
+    "ipv4": [{"ipaddr": "127.0.0.1/8"}],
+    "ipv6": [{"ipaddr": "::1/128"}, {"ipaddr": "fe80::1/64"}]
+  },
+  {
+    "identifier": "wg1",
+    "device": "wg1",
+    "description": "WireGuard",
+    "addr4": "",
+    "ipv4": null
+  }
+]