Add support to enlist component-versions & statuses of OpenEBS

[vharsh]

Component-versions

Scope

As of now, there's a sub-command version which helps end users get info about the version of this kubectl-plugin, just like kubectl it can be expanded to give in more information about installed OpenEBS versions, etc from component labels.

TUI UX

// need to discuss with the community for better usability & debug-ability
$ kubectl openebs cluster-info.
CAS-TYPE       VERSION        STATUS
CStor            3.0             Good
LocalPV          2.9             Upgrade available
CStor-Legacy     1.4             Good

Much later, more functionality can be added which can raise more potential red-flags besides quality information, like kubectl get cs or kubectl cluster-info, a good source could be the ERROR/WARNING events from the Storage provisioners, CSI pods, etc, if it's not super easy to do so via kubectl get events --<flags>