Extend teleport-operator to create teleport app agent configmap

[tuladhar]

Summary

• In order to run teleport app agent to register web apps, it needs a teleport join token and configmap.

appResources:
- labels:
    'mc': 'golem'
authToken: f84a4...
joinTokenSecret:
  create: true
  name: teleport-app-agent-join-token
proxyAddr: teleport.giantswarm.io:443
roles: app
teleportVersionOverride: 14.1.3

• teleport app agent, will re-use the same teleport-kube-agent chart, with different set of values to only run it as app agent.

Action items:

• We need to extend operator to create a configmap same as teleport-kube-agent, but with app role.