Figure out how to migrate CRDs across groups

[chrisseto]

Kubernetes has native support for versioning CRDs provided they remain within the same GroupVersion. We have ~2 concrete cases where we'll want to be able to migrate a CRD (and it's CRs) to a different GroupVersion, the Flux CRDs and operator V1's CRDs.

Ideally, we develop a generic/re-usable strategy that allows us to perform these types of migrations whenever.

VMWare has an unmaintained tool that does this: https://github.com/vmware-archive/crd-migration-tool.

We'll also want to make sure that this type of migration can be performed seamlessly when using terraform to manage a cluster.

JIRA Link: K8S-205