Implement IP Reservation Requests

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What problem are you facing?

It is not yet possible to create IP reservations (EIPs) using Crossplane.

Some use cases for EIPs:

• Creating EIPs with the appropriate tags for the Equinix Metal CCM to use these addresses for loadbalancer purposes
• Create EIPs that can be consumed by Crossplane created Devices (reservation_ids support must be added first, see https://doc.crds.dev/github.com/packethost/crossplane-provider-packet/server.metal.equinix.com/Device/v1alpha2#spec-forProvider-ipAddresses)
• Create IP reservation ranges for use by ClusterAPI machine templates (IPReservation support is not yet present) https://doc.crds.dev/github.com/kubernetes-sigs/cluster-api-provider-packet/infrastructure.cluster.x-k8s.io/PacketMachineTemplate/v1alpha3

How could the Equinix Metal Crossplane Provider help solve your problem?

• Implement IP Reservation Requests. https://metal.equinix.com/developers/api/ipaddresses/#retrieve-all-ip-reservations
• Implement IP Device Assignments. https://metal.equinix.com/developers/api/ipaddresses/#create-a-ip-assignment

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39 corrected IPAddresses setting from the Device spec, so it is now possible (in master) to get some of this EIP behavior at device creation time.

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reservation id and the address or range provisioned should both be made available as referencers

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Closing for #69

IP Reservation support is present in https://github.com/crossplane-contrib/provider-jet-equinix