support generate bash completion

[wu0407]

like this kubectl tree completion bash

[ahmetb]

Plugins don’t support bash completion. See Kubernetes repo for relevant issue.

[mikaello]

Plugins don’t support bash completion. See Kubernetes repo for relevant issue.

I guess the issue you are referring to is kubernetes/kubernetes#74178 ? This was resolved by kubernetes/kubernetes#105867, so I think bash completions are supported for plugins now

[ahmetb]

Correct. I shall open this issue. We're yet to implement in a generic way for Krew plugins. There's an open issue for that in krew repo as well.