Simple port forwarding

[fwilhe]

What would you like to be added:

When running a vm via start-vm it seems there is no simple way to forward any non-ssh port. Sometimes you'll want to forward a port to your host, for example when a web service is running on any port like 5000 or 8080.

Why is this needed:

I was following the oras tutorial where they describe the web ui of the ZOT registry which I could not easily follow with this method.

[fwilhe]

The syntax seems to be described here