Implement `kubectl-ng version`

[jacobtomlinson]

kubectl version --help            
Print the client and server version information for the current context.

Examples:
  # Print the client and server versions for the current context
  kubectl version

Options:
    --client=false:
        If true, shows client version only (no server required).

    -o, --output='':
        One of 'yaml' or 'json'.

Usage:
  kubectl version [flags] [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).