Add support for kyrat-ing into kubernetes pods / containers

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. 