Rex::Virtualization doesnt accept a hashref like intended

Describe the bug

The intention seems to be to permit:

set virtualization => {
  type => 'LibVirt',
  %other
}

However in the above case the "type" would just be saved in to Rex::Config and that would be it.

Expected behavior

With

set virtualization => {
  type => 'LibVirt',
  %other
}

The entire hashref would be loaded

How to reproduce it

As above

Code example

set virtualization => {
  type => 'LibVirt',
  %other
}

Rex::Config->get("virtualization");

Additional context

No response

Rex version

1.13.4

Perl version

any

Operating system running rex

any

Operating system managed by rex

any

How rex was installed?

cpan client

Start by tracing how the set virtualization hashref is handled and stored by Rex::Config, using the reproduction in the issue as the entry point. Compare the current behavior with the expected behavior: the complete hashref, including type and other values, should be retrievable through Rex::Config->get("virtualization").