Vscode: Allow to customize kubesquash image

[allamand]

When working with private kubernetes cluster it may not have access to internet to download kubesquash image from docker registry.

It would be nice to have a kubesquash vsCode plugin parameter that allow to precise a custom docker image :

let stdout = yield exec(`kubesquash --container-repo <my-private-repo> -machine -debug-server -pod ${selectedPod.metadata.name} -namespace ${selectedPod.metadata.namespace}`);

[yuval-k]

in the latest release we have added the extraArgs option that are just passedthrough to kube squash. this should address this too.

[allamand]

Thanks for your great work :)