[feature] Include default metadata

[brandonkal]

Given that a standard pod starts like this

apiVersion: v1
kind: Pod
metadata:
  name: myapp
  labels:
    name: myapp

and a deployment starts like this

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  selector:
    matchLabels:
      app: myapp

I would like to see

new kx.Deployment('name', {
    spec: pod.asDeploymentSpec(),
})

default to set the deployment's metadata property to: { name: firstArg }