Creating a new API group is really hard

@caesarxuchao

Creating a new API group is really hard. I'll keep this description up to date as I go through the pain.

You have to know to add yourself to the import_known_versions.go files in multiple packages to get included.
You have to manually update these files to get the generated output:
1. hack/after-build/update-generated-conversions.sh
2. hack/after-build/update-generated-deep-copies.sh
3. hack/after-build/verify-generated-conversions.sh
4. hack/after-build/verify-generated-deep-copies.sh
5. hack/update-generated-swagger-docs.sh
You have to manually create types.generated.go in every internal and external package to get codec-gen to work.
You have to update pkg/api/registered/registered.go to be allowed to install your group.

That's just to get your types registered. Right now, there's no pluggable way to include custom RESTStorage into the API server for my new types.

@caesarxuchao @lavalamp @liggitt @smarterclayton
@kubernetes/rh-cluster-infra @kubernetes/goog-csi

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