namespace switching

[pjaudiomv]

This adds a namespace switcher which allows you to set a namespace to current set kubeconfig context
IE snippet from kubeconfig. will take this which uses default

- context:
    cluster: k3d-k3s-default
    user: admin@k3d-k3s-default
  name: k3d-k3s-default

and set this

- context:
    cluster: k3d-k3s-default
    namespace: flux-system
    user: admin@k3d-k3s-default
  name: k3d-k3s-default

> kxd ns l
 default
 flux-system
 kube-node-lease
 kube-public
 kube-system
 metallb-system

> kxd ns s
  Kubeconfig Namespace Switcher
  Choose a namespace? flux-system

> kxd ns c
 flux-system

[caesarshift]

lgtm