Is your feature request related to a problem? Please describe.

I would like to be able to import existing resources to aid in getting a matching config and to avoid having to re-image existing VMs to bring them under terraform management.

Describe the solution you'd like

The ability to import VM resources (and others)

Describe alternatives you've considered

The other ProxMox plugin supports imports, but it hasn't seen any active development so I'm considering using this one.

Additional context

I looked in to what it would take to support imports. Usually the resource can implement the "Importer" field using the included schema.ImportStatePassthrough identity function which sets the ID and relies on the resource read to populate the current state. However, because this plugin is using just the numerical ID to as the resource ID it's not possible to use the REST API with just the ID.

The other proxmox plugin uses a string containing both fields as a VM id, for example "host10/qemu/100" instead of just "100" which makes import easy.