Optimize olmv1 kubectl plugin UX

[ankitathomas]

rework the olmv1 kubectl plugin UX from the olmv0 kubectl-operator style UX to be more consistent with olmv1 vocabulary and typical kubectl/cli best practices.

This includes updating documentation to reflect the cli structure and any changes to it.

[azych]

Make sure to discuss: operator-framework/kubectl-operator#220 (comment) and operator-framework/kubectl-operator#220 (comment)

[azych]

also, some context for the ideas driving olmv1 commands up to this point: operator-framework/kubectl-operator#225 (comment) (see general comments section)