feat: collect Kubernetes Endpoints in sysdump

[tpfister-form3]

Adds the collection of Kubernetes Endpoints to the sysdump command as requested in #520

Signed-off-by: Thorsten Pfister thorsten.pfister@form3.tech

Tested with a local dummy cluster which lead to the additional creation of a k8s-endpoints-20220414-124930.yaml file in the sysdump archive with the following truncated content:

apiVersion: v1
items:
- metadata:
    creationTimestamp: "2022-04-14T10:45:01Z"
    labels:
      endpointslice.kubernetes.io/skip-mirror: "true"
...
<snip>
...
kind: EndpointsList
metadata:
  resourceVersion: "838"

Fixes #520

[aanm]

thank you, this will be useful!

[sayboras]

LGTM 💯

We can add EndpointSlice as well, not necessarily required in this PR though.

[tklauser]

Thank you @tpfister-form3!