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.

README.md

@@ -89,6 +89,7 @@ arguments.
 | `get_mac_address_table` | ❌ | Not applicable (firewall, no L2 switching) |
 | `ping` | ✅ | `POST /api/diagnostics/ping/set` + `start` + `search_jobs` + `stop`/`remove` |
 | `get_listening_sockets` | ✅ | `GET /api/diagnostics/interface/get_socket_statistics` + `/api/core/service/search` + `/api/wireguard/service/show` (WireGuard's kernel sockets by listen port) |
+| `get_virtual_ips` | ✅ | `GET /api/interfaces/overview/export`: every address bound to a CARP VHID (CARP address and IP aliases on it), with this node's CARP state. `interfaces/vip_settings` is not read: it carries the CARP passwords |
 | `ping_sweep` | ✅ ³ | same endpoints, one batch of parallel jobs at a time |
 
 > ¹ Requires the `os-lldpd` plugin. Returns empty dict if the plugin is not installed.