feature: attempt to import images from the host

[squidboylan]

This is an attempt to address #402 . Throwing this up here to get thoughts on this approach, there's still more work to do including supporting package customization and tests. I considered using https://github.com/kubernetes-sigs/kind/blob/10e058c534cf6b8546be70f1eea2e414a08ff770/pkg/cluster/nodeutils/util.go#L80 like described in the issue but that seems to require a lot more code that is already implemented in kind, and this was the easiest way i could think of reusing that kind code. I admit calling the kind cobra command directly feels like a bit of a hack but at least it's likely to be stable? This also doesnt get us all the way to fixing #415 because it doesnt support images referenced by digest because of kubernetes-sigs/kind#2394 .

[nabuskey]

Hmmm I wonder if we should use kind load or let another cache program do this for us. @punkwalker What do you think?

[cmoulliard]

Hmmm I wonder if we should use kind load

As mentioned by Cale, kind load do a lot of things under the hood to upload a tarball of an image as it must access the kindnet container to execute some internal commands.