feat: Add {add,delete} node commands

[booxter]

On add, a new node of the chosen role is created and joins the k8s
cluster.

On delete, the node is removed from etcd cluster, drained and gracefully
removed from k8s cluster.

Note: only docker is implemented. Other backends can be added later as
needed.

Signed-off-by: Ihar Hrachyshka ihrachyshka@nvidia.com
Assisted-By: Claude Code; claude-sonnet-4-20250514

---

RFE: #4034

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @booxter. Thanks for your PR.

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[BenTheElder]

Thanks for the PR. We generally ask that features be discussed in an issue first as per our contributing guide:

https://kind.sigs.k8s.io/docs/contributing/getting-started/#4-reaching-out

[aojea]

yeah, also explain better what is the use case for adding this behavior

[booxter]

Thanks folks. Let me put it in draft to make it clear it's not ready for review. Will follow up with a RFE issue later.

[booxter]

This won't be allowed in kind. We will discuss in RFE ways forward; then close RFE too once we know where the code better belongs.