Input Plugin: containerd or cri for kubernetes

### Proposal:

As dockershim is deprecated in kubelet for kubernetes, it would be great to get an input plugin for CRI environments/runtimes.

### Current behavior:

The kubernetes input plugin does not fully replace the docker input plugin, as metrics like "exit_code" of containers (and many more) are missing

see https://kubernetes.io/blog/2020/12/02/dont-panic-kubernetes-and-docker/

Start by reviewing the existing Kubernetes and Docker input plugins and the linked Kubernetes runtime guidance. Determine the CRI or containerd scope and which missing metrics, including container exit_code, must be supported. Done means a defined input plugin for CRI environments that provides the required replacement metrics.

Written by the indexing model from the issue text.