PodDisruptionBudget types are incorrect

[maxweisel]

Describe the bug
V1beta1PodDisruptionBudgetSpec defines minAvailable and maxUnavailable as type object but the spec accepts string or number.

** Client Version **
e.g. 0.14.3

** Server Version **
e.g. 1.17.17

To Reproduce
Steps to reproduce the behavior:

Try to compile the following:

const kubeconfig = new Kubernetes.KubeConfig()
const kubernetesPolicy = kubeconfig.makeApiClient(Kubernetes.PolicyV1beta1Api)
kubernetesPolicy.createNamespacedPodDisruptionBudget({
  apiVersion: 'policy/v1beta1',
  kind: 'PodDisruptionBudget',
  metadata: {
    name: 'test',
  },
  spec: {
    minAvailable: 2,
    selector: {
      matchLabels: {
        app: 'test'
      }
    }
  }
}

Expected behavior
I'd expect the typescript compiler to allow this. However, instead it complains that minAvailable is not of type object

Environment (please complete the following information):

• OS: Mac
• NodeJS Version 14 LTS

[brendandburns]

This is a duplicate (though for a different field) of #666

The net-net is that we don't support any fields of IntOrString types very well.

Closing in favor of #666, there are instructions in that issue about how we need to approach fixing this, if you have time, otherwise I will get to it eventually.