Add k8s segment to show context and namespace info

[3coma3]

Hi, I added this segment to avoid making mistakes when using multiple k8s contexts/namespaces.

Hope you find it useful, any corrections welcome, and if something is missing for integration, just let me know.

Requirements kubectx and kubens from https://github.com/ahmetb/kubectx in PATH

Configuration

  "k8s": {
    "ltrim": bool,
    "rtrim": bool,
    "symbol": bool,
    "max_context": number,
    "max_namespace": number,
    "colorize": bool,
    "colorize_symbol": bool
  }

ltrim, rtrim: do not add space at left or right (compatibility with some theme mods)

symbol: show k8s symbol

max_context, max_namespace: cut with an ellipsis context or namespace, use 0 to supress output

colorize, colorize_symbol: auto-colorize based on the information string

Theme K8S_FG = 57 K8S_BG = 7 K8S_SYMBOL_FG = 57