[chore] Upgrade CRDs to apiextensions.k8s.io/v1

[gaocegege]

/kind feature

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The api group apiextensions.k8s.io/v1beta1 is no longer served in k8s 1.22 https://kubernetes.io/docs/reference/using-api/deprecation-guide/#customresourcedefinition-v122

kubeflow APIs need to be upgraded

/cc @alculquicondor

Maybe there is problem about kubernetes/apiextensions-apiserver#50

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[andreyvelich]

@gaocegege I was able to run Experiments with this CRD and temp openAPIV3Schema:

apiVersion: apiextensions.k8s.io/v1
kind: CustomResourceDefinition
metadata:
  name: experiments.kubeflow.org
spec:
  group: kubeflow.org
  scope: Namespaced
  versions:
    - name: v1beta1
      served: true
      storage: true
      additionalPrinterColumns:
        - name: Type
          type: string
          jsonPath: .status.conditions[-1:].type
        - name: Status
          type: string
          jsonPath: .status.conditions[-1:].status
        - name: Age
          type: date
          jsonPath: .metadata.creationTimestamp
      subresources:
        status: {}
      schema:
        openAPIV3Schema:
          type: object
          x-kubernetes-preserve-unknown-fields: true
  names:
    kind: Experiment
    singular: experiment
    plural: experiments
    categories:
      - all
      - kubeflow
      - katib

To generate openAPIV3Schema using controller-gen we should make some changes in APIs.
First of all, we have to remove float from our CRDs APIs(https://github.com/kubeflow/katib/blob/master/pkg/apis/controller/common/v1beta1/common_types.go#L100).
Ref issue: #889.

@gaocegege @johnugeorge Do we want to switch our CRDs to apiextensions.k8s.io/v1 at least ?

[gaocegege]

apiextensions.k8s.io/v1beta1 is deprecated, thus I think we should do it.