Allow filtering IP addresses by family in GraphQL

[mraerino]

Fixes: #19605

This adds (back) the ability to filter IP addresses by their family, similar to how the REST API or list filtering capabilities in Netbox.

I've tested two queries manually:

query simple {
  ip_address_list(filters: {family: FAMILY_6}) {
    address
    family {
      label
    }
  }
}

query complex {
  device_list(filters: {interfaces: {ip_addresses: {family: FAMILY_6}}}) {
    interfaces {
      ip_addresses {
        address
        family {
          label
        }
      }
    }
  }
}