[PoC] IP utilization

[aepifanov]

- What I did
Added implementation for showing 2 counters of available IP addresses for docker network:

• Available Allocation IPs - IPs that are allocated dynamically for assigning service’s VIPs/LBs/Tasks and might be specified by --ip-range option during the network creation.
• Available IPs - all available IPs in a network (including the Available Allocation IPs) which might be assigned manually to a container
  These counters are visible in network inspection:

/# docker network inspect my -v
[
    {
        "Name": "my",
        "Id": "4a0l4jrhbi81p6hwrkqmgetef",
...
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {                                                                                                                                                                                                                     
                    "Subnet": "192.168.10.0/24",
                    "IPRange": "192.168.10.0/29",
                    "Gateway": "192.168.10.1"
                }
            ]
        },
        "AvailableIPs": 253, <---------------
        "AvailableAllocationIPs": 6, <---------------
        "Internal": false,
        "Attachable": false,

- How I did it
https://docs.google.com/document/d/1CmmCe1T8ze8tAOyl3MKsJj_1hVlzpSGK7D4kclS9PW0/edit?tab=t.0

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)