Add features to k8s-service module

[jocchionero]

What would you like to be added:

1. Would like dashes allowed in k8-service module, current error is:

ERROR: Invalid module name, can only contain letters and numbers!
If you need more help please reach out to the contributors in our slack channel at: https://slack.opta.dev

2. Would like to have custom health checks in same k8s-service module like in standard k8s yaml

  - name: my-service
    type: k8s-service
...
    livenessProbe:
      exec:
        command:
        - cat
        - /tmp/healthy
...

Why is this needed:

1. This is a request from my team to stay consistent with current environments (pre opta migration)
2. A request from my team to allow this while we create actual health-check endpoints AND for 3rd part containers where we do not control the code to expose endpoints

Extra info (e.g. existing slack convo link):

https://opta-group.slack.com/archives/C0240NBKUMT/p1652223456899139

[juandiegopalomino]

release is out