Added KFService types (#8)
Added KFService types (#8)

* Added KFService types

* Added Canary as a top level spec and fixed a few optional fields

kubeflow/kfserving-lts,kubeflow/kfserving-lts,kubeflow/kfserving-lts,kubeflow/kfserving-lts,kubeflow/kfserving-lts,kubeflow/kfserving-lts