Migrate to the new metalstack/v2 api

To support the new resource scoped API:

All calls to the metal-api are currently located in 2 files:

pkg/resources/metal/ip.go
and
pkg/resources/metal/machine.go

IP related endpoints are already implemented here: https://github.com/metal-stack/api/blob/main/proto/metalstack/api/v2/ip.proto

Machine endpoints will come next.