Automatic merge from submit-queue (batch tested with PRs 41604, 41273, 41547)

Switch pv controller to shared informer

This is WIP because I still need to do something with bazel? and add 'get storageclasses' to the controller-manager rbac role

@jsafrane PTAL and make sure I did not break anything in the PV controller. Do we need to clone the volumes/claims we get from the shared informer before we use them? I could not find a place where we modify them but you would know for certain.

cc @ncdc because I copied what you did in your other PRs.