Add inspect command for oc-mirror to get a list of images without validation

Story: As a user of disconnected OpenShift clusters, I want to list images for Openshift releases and operator bundles without lifecycle management validation.

Background: Users have the requirement to use oc-mirror to just produce image lists while using the imageset configuration as input and allow manual validation or manual catalog creation. See https://github.com/openshift/oc-mirror/issues/461

Acceptance criteria:

• oc mirror can get a list of images with the imageset configuration file as input without lifecycle management operations.