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.

napalm_opnsense/opnsense.py

@@ -53,12 +53,13 @@ import requests
 from requests.exceptions import RequestException
 
 from napalm_device_types import FingerprintRule, FirewallDriver
-from napalm_device_types.models import ListeningSocketsDict
+from napalm_device_types.models import ListeningSocketsDict, VirtualIpsDict
 from napalm.base.exceptions import ConnectionException, ConnectionClosedException, MergeConfigException
 
 from napalm_opnsense.listening import parse_socket_statistics, wireguard_listen_ports
 from napalm_opnsense.ping_mixin import OPNsensePingMixin
 from napalm_opnsense.port_forwards import alias_index, port_forwards, wan_interfaces
+from napalm_opnsense.virtual_ips import carp_addresses
 
 
 class OPNsenseDriver(OPNsensePingMixin, FirewallDriver):
@@ -1824,6 +1825,22 @@ class OPNsenseDriver(OPNsensePingMixin, FirewallDriver):
             "sockets": parse_socket_statistics(statistics, services, wireguard),
         }
 
+    def get_virtual_ips(self) -> VirtualIpsDict:
+        """The firewall's CARP addresses, and whether this node holds each.
+
+        From ``/api/interfaces/overview/export``: every address bound to a CARP
+        VHID, the CARP address and IP aliases on its VHID alike, with this node's
+        CARP state (:mod:`napalm_opnsense.virtual_ips`). vip-manager and keepalived
+        are Linux mechanisms and are not looked for (None).
+
+        :raises: whatever the request raises -- an unread overview is not "no CARP".
+        """
+        return {
+            "vip_manager": None,
+            "keepalived": None,
+            "carp": carp_addresses(self._get("/api/interfaces/overview/export")),
+        }
+
     def manage_service(self, name: str, action: str) -> dict[str, Any]:
         """Execute a lifecycle action on an OPNsense service.