Add kubelinter checks to Kubescape and document migration path #1396

The kube-linter project does a subset of the work that Kubescape does, but it may also include some checks that Kubescape does not.

Someone should look through all its checks, map them against Kubescape controls, and add extra controls for anything missing. These would make good contributions to the DevOpsBest framework in the regolibrary repo.