implement a kubectl drop-in

[dweomer]

We should ship a kim binary that supports being renamed/symlinked as kubectl-image (or possibly simply a separate binary altogether) that can be used as a client-side drop-in for kubectl such that these commands would work as expected:

• kubectl image build --tag your/image:tag .
• kubectl image ls
• kubectl image pull your/image:tag
• kubectl image push your/image:tag
• kubectl image tag your/image:tag some/other:image