Enhance oc-mirror to report version number of operator mirrored

Currently, when running oc-mirror to mirror operators for an offline environment, there is no way to tell what version of any operator has been mirroed without either pulling apart the index image to get the metadata or loading the catalog index into a running OpenShift cluster.

Enhance oc-mirror to output, in some form, what version of any operator, i.e AAP, has been mirrored.

This is important for customers that track operator versions for security purposes and require the version number of the operator to check CVEs before they allow it into their environment in any form.

It is possible to tell oc-mirror directly what version to mirror but when mirroring 'latest', for example, there is no easy way to see what version it is mirroring.

The version output could be on the command line or in a metadata file as part of the workspace. Anywhere that is easy to find.