feat(providers)!: improve kubernetesGateway and Gateway API support

[darkweaver87]

What does this PR do?

This PR adds support of new stable kubernetesGateway provider powered by traefik > v3.1.0.

Motivation

Support Traefik v3.1 features.

More

• Yes, I updated the tests accordingly
• Yes, I ran make test and all the tests passed

[travisghansen]

This is great to see better support coming! A couple extra thoughts from a user:

• I don't particularly love the inclusion of the gateway-api crds, although I understand the desire
• To support multiple deployments of traefik in a single cluster I think we need
  • an ability to control the names of both the gateway class and gateway object
  • it should be possible to set special labels on the gateway class to use in conjunction with the --providers.kubernetesgateway.labelselector="app=traefik" argument
  • it should be possible to enable gateway-api support and disable the gateway and gateway class completely but separately (ie: I should be able to deploy with the gateway class but disable the included gateway resource)
  • ability to enable the rbac indepedent of deploying the gateway/class

[darkweaver87]

@travisghansen I added your suggestions. Considering CRDs I don't have much choice with helm to include it :-/
For those who want, like you, you still have the capability to set --skip-crds to helm install command and apply a selected subset of CRDs.

[mloiseleur]

PR looks good 👍
See my comments for last suggestion on how to present it in values.

[travisghansen]

@travisghansen I added your suggestions. Considering CRDs I don't have much choice with helm to include it :-/ For those who want, like you, you still have the capability to set --skip-crds to helm install command and apply a selected subset of CRDs.

Awesome! Much appreciated the consideration. A quick overview seems to indicate this has everything I need to cover my current use-case. Once the chart is released however I will give it a thorough try and make sure all is there to handle my currently hacky setup.

[mloiseleur]

LGTM

[travisghansen]

It seems like the argument here may be in the wrong order, I can't seem to override?

name: {{ default .Values.gateway.name "traefik-gateway" }}