[FEATURE] Support virtual media mount

[starbops]

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

This long-awaited feature could make several virtual machine provisioning use cases possible. With this feature implemented, we will be able to dynamically attach an ISO image to the target virtual machine and boot from it.

Describe the solution you'd like

My initial thought is, this will need a third-party storage solutions to handle the volume lifecycle. We should do our best to make our part as neutral as possible, at least giving users the ability to choose which solution to use via configuration. As I use Harvester a lot, Longhorn seems a good fit. However, CDI could also be a valid candidate. With that said, both are a bit overkill for our use case. If this is infeasible or intolerable, we must handle the image and volume ourselves.

Describe alternatives you've considered

N/A

Additional context

This is one of the remaining item from #2.