Add support for creating a VRF IP Reservation

[displague]

What problem are you facing?

Once I create a VRF, I can not create the IP reservations against that VRF.

https://deploy.equinix.com/developers/docs/metal/interconnections/vrf/#creating-a-vrf-ip-address-reservation
https://deploy.equinix.com/developers/api/metal/#tag/IPAddresses/operation/requestIPReservation (see the VRF tab)

Method	HTTP request	Description
RequestIPReservation	Post /projects/{id}/ips	Requesting IP reservations
FindVrfIpReservation	Get /vrfs/{vrf_id}/ips/{id}	Retrieve all VRF IP Reservations in the VRF
FindVrfIpReservations	Get /vrfs/{id}/ips	Retrieve all VRF IP Reservations in the VRF

How could the Equinix Metal CLI help solve this problem?

metal ips request --type vrf --vrf-id <id> --cidr <cidr, 22-29> --network <network, IP address> --tags foo --tags bar --customdata {"my":"goodness"} --details "i don't think VRF users need this or will see it after submitting the request"'

metal vrf --id <vrf_id> ips
metal vrf --id <vrf_id> ips --ip-id <ip_id>

Related to #268

[codinja1188]

/assign @codinja1188

[ctreatma]

Closed by #418