Support for traefik.io api group version

[tomsozolins]

Summary

What change needs making?

Add support for traefik.io crd API group version.

Use Cases

When would you use this?

In Traefik v3 support for Kubernetes CRDs API Group traefik.containo.us has been removed - https://doc.traefik.io/traefik/master/migration/v2-to-v3/#kubernetes-crds-api-group-traefikcontainous

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Message from the maintainers:

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[zachaller]

This probably is not to bad of an additiont to add we use an dynamic unstructured client so you just need to use change how that client gets created I think. Here is the start of that code https://github.com/argoproj/argo-rollouts/blob/master/utils/defaults/defaults.go#L63

[DrFaust92]

Ill take a look at this

[DrFaust92]

PR Ready