Add support for kyrat-ing into kubernetes pods / containers

[csm10495]

I use kyrat regularly for ssh'ing into hosts and having some bashrc macros quickly available. Any chance it can be updated/augmented to support entering a kubernetes pod via kubectl exec -it ....

Right now I can do
kubectl exec -it <POD> -- bash
to get a bash shell in the POD.

Optimally I could instead run

kyrat POD to kyrat into the POD and have all my bashrc, etc. stuff.