copy most of the k8s.io/client-go cache/sharedInformer

[deads2k]

We will use very similar logic to drive our controllers based on cosmos plus change feeds. We will start with just being able to do repeated lists.

/assign @mbarnes

The next step is to wire it to start against somethign that can list all active operations.

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ci/prow/baseimage-generator-images	61fd222	link	true	/test baseimage-generator-images
ci/prow/integration	61fd222	link	true	/test integration
ci/prow/verify	61fd222	link	true	/test verify
ci/prow/e2e-parallel	61fd222	link	true	/test e2e-parallel

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[deads2k]

/hold

Making a fake lister/watcher with fake runtime.Object and kube metadataaccessor is ugly, but it might be slightly prettier than this. I'll try it

[deads2k]

The alternative presented in #3955 is better. It keeps our maintenance smaller.