[CRD] Support Gateway API Experimental CRDs

[smoench]

Welcome!

• Yes, I've searched similar issues on GitHub and didn't find any.
• Yes, I've searched similar issues on the Traefik community forum and didn't find any.

What did you expect to see?

Since there is a opportunity of installing CRDs separately via a helm chart, I was wondering if it would make sense to support the Gateway API experimental channel as well. Traefik has an opt-in configuration and even needs the experimental channel CRDs to be applied -> https://doc.traefik.io/traefik/providers/kubernetes-gateway/#experimentalchannel

I would suggest to introduce a new option gatewayAPIExperimentalChannel (or similar) to the CRD helm chart. This option would win over the existing gatewayAPI-option when both are activated. It wouldn't make sense to install both at the same time even it won't break anything as far as the experimental channels crds are installed last

[mloiseleur]

Hello @smoench ,

It's true that CRDs of experimental channel could be installed with the CRD Chart.

Feel free to open a PR if you need it.