Add support for multiple virtual machine disks

[drossy]

Netbox 3.7.5 adds the ability to represent multiple virtual machine disks https://docs.netbox.dev/en/stable/release-notes/version-3.7/, it might be good to add this functionality to netbox2aquilon to more accurately represent the disks used by a VM, rather than just the total size. The netbox developers also mention that the current model may be removed in the future at some point

Possibly it could even be extended to physical devices though that would need to use inventory items.