[WIP] Code for extension install and delete

[LalatenduMohanty]

Here are the commands to test the PR.

$ kubectl operator olmv1 install extension argocd --package-name argocd-operator --version 0.6.0 --namespace argocd --service-account argocd-installer
extension "argocd" created

$ kubectl operator olmv1 get extension
NAME    INSTALLED BUNDLE        VERSION  SOURCE TYPE  INSTALLED  PROGRESSING  AGE
argocd  argocd-operator.v0.6.0  0.6.0    Catalog      True       True         65s

$ kubectl operator olmv1 delete extension argocd
deleted extension "argocd"

[LalatenduMohanty]

As discussed with @joelanford and @ankitathomas, not adding the code for CatalogSelector in this PR, we can add this as a follow up.