include Addon's version in ocm list command output

[bdattoma]

Hi! I wonder if it would be a good idea to include the versions of the available add-ons on a cluster among the retrieved information by ocm list -c <CLUSTERID> addon. I think it could be useful especially for Addon-developers/testers.

I see there is the --columns flag but which is the full list of available columns? I've tried with "version" and thing like this but nothing is found.

Thanks!