karellen / kubernator / 24375642090

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Add k3d plugin for local k3s-in-Docker clusters (#101)

## Summary

- Adds a `k3d` plugin that mirrors the `kind` plugin at feature parity:
same lifecycle verbs (`start_fresh`, `keep_running`), same context
shape, same `_wait_for_apiserver` post-resume TLS probe, same
cluster-config generation pattern. Defaults node image to
`rancher/k3s:v<k8s_version>-k3s1` (multi-arch, upstream Rancher).
- Uses k3d's native `cluster start` / `cluster stop` subcommands rather
than orchestrating `docker start/stop` ourselves (the kind plugin has
to, because kind lacks those).
- Strips the k3s `+k3sN` version suffix (and simplifies the always-true
EKS/GKE guard) in `plugins/k8s.py` so that `server_git_version` points
at a valid upstream `kubernetes/kubernetes` release tag for the OpenAPI
spec download.
- Adds `k3d_smoke` and `k3d_multi_node` integration tests mirroring
`minikube_smoke` / `multi_node`, and 13 new unit tests covering config
generation, validation, provider detection, and latest-tag parsing.

## Test plan

- [x] `pyb run_unit_tests` — 30 unit tests pass (13 new).
- [x] `pyb run_integration_tests -P
integrationtest_file_glob='k3d_*_tests.py'` — smoke + multi-node pass
against real Docker.
- [ ] README plugin table row, kubeconfig note, and new `k3d Plugin`
section read consistently.

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