Add support for immutable ConfigMaps

[matthyx]

What is the feature and why do you need it:
Feature is in beta since 1.19 and it would be nice to allow using it:
https://kubernetes.io/docs/concepts/configuration/configmap/#configmap-immutable

Describe the solution you'd like to see:
Allow setting immutable in a ConfigMap (or Secret) declaration, instead of getting this kind of error:
TypeError: init() got an expected keyword argument 'immutable'

[roycaihw]

The python client is lagging behind Kubernetes releases. New releases are tracked in: #1242

[matthyx]

I see, do you need help from me?

[roycaihw]

I plan to sync with the current contributors on how we can unblock the releases. Will have more to share once we discuss the next steps.

[fejta-bot]

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/lifecycle stale

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[k8s-ci-robot]

@k8s-triage-robot: Closing this issue.

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