enable oc-mirror to generate report from ImageSetConfiguration

1. Proposed title of this feature request
enable oc-mirror to generate report from `ImageSetConfiguration`

2. What is the nature and description of the request?
It would be very helpful if oc-mirror could generate a report from the `ImageSetConfiguration` file to simplify the process of managing operator versions in disconnected environments.

The report would serve several functions for system administrators

• Validate the ImageSetConfiguration such as syntax, channels and minVersion, maxVersion
• Report if newer versions of operators are available

3. Why does the customer need this? (List the business requirements here)

• Managing operators in a disconnected environment is a very manual task, the information in such a report could serve to streamline the operator management process.

4. List any affected packages or components.
oc-mirror