Proposal: marketplace CLI

It's nice to install operator via UI, but when you run things from command line, or in a CI environment, it's not that easy to deal with subscriptions, operatorgroups and CSV. In some cases we added bash scripts to have more control on operatorgroups or wait for a subscription to be satisfied. I'm asking around, so I ask also here. Why not adding a CLI to do stuff with operators available in a cluster marketplace? Listing, installing, checking or create groups etc. That could be also technically embedded in the `oc` or `kubectl` CLI.