Add spec.suspend to default print columns

[schrej]

Almost all flux Resources have the option to suspend them. While using flux get makes it easy to find suspended resources, kubectl get currently doesn't show it by default.

I think the kubectl get default output should be changed to be closer to what flux get shows, or at least the suspend field should be added, as finding a suspended Resource is a frequent use-case in my opinion.

I've opened fluxcd/kustomize-controller#561 already, and would be open to do the same for all other controllers as well.

[jflambert]

would love to have this, it would integrate nicely with k9s