[feature] Dual stack IP assignment

[dougbtv]

One thing that could potentially be possible with Whereabouts is to assign multiple IP addresses to handle a dual stack scenario.

The CNI spec for IPAM shows that the well-known ips field accepts multiple instances

Potentially, we could account for this using a "list of ranges" and have an arbitrary number of ranges allowed.

ranges: ["192.168.2.1-192.168.2.150","2001::1-2001:20"]

[uablrek]

IMO whereabouts should re-use the host-local configuration for multiple addresses rather than invent something new. Simpler for users and developers and no need for extra documentation.

[uablrek]

Is there really no way currently of using whereabouts in a dual-stack environment?