[FEATURES] Upgrade controller runtime and K8s version

[cheyang]

What feature you'd like to add:

1. Upgrade K8s to 1.20.10
2. Upgrade controller-runtime to 0.8.3 and controller-gen to 0.7.0, and adopt the breaking change of them

• The interface for client.Get, Client.Create, Clident.Update is changed from runtime.Object to client.Object
• The parameter of function Reconcile is changed from req ctrl.Request to ctx context.Context, req ctrl.Request
• some test function is deprecated.

3. Upgrade API version

• CustomResourceDefinition from apiextensions.k8s.io/vebeta1 to apiextensions.k8s.io/v1
• CSIDriver from storage.k8s.io/v1beta1 to storage.k8s.io/v1
• MutatingWebhookConfiguration from admissionregistration.k8s.io/v1beta1 to admissionregistration.k8s.io/v1

Why is this feature needed:

The purpose is to match K8s 1.22 and above. As you know a lot of APIs are removed since 1.22, including CSI, CRD, webhook. We have to upgrade the K8s version, and during the upgrade we found the controller-runtime has to be upgraded also.