Support for Istio Gateway API

[nrfox]

Kiali should support the new Gateway API and other new networking resources such as HTTPRoute.

Support would entail:

• Added K8s Gateway API objects to Istio Config list page #5485
• Badging gateways correctly on the graph #5490
• Validations for Gateway API objects #5501
• Gateway API Objects - Include in wizards #5502
• Gateway API in Console Plugin

[lucasponce]

This issue is big.
It should start with supporting these new objects but it can't replace the current functionality invalidations and wizards.
Also, co-existing both implementations will have side effects as these new API is under evolution and it's not a 1-to-1 related to the Istio Gateway/VirtualService.

Another aspect is this API is optional and it requires the admin to install it separately, this would affect and it would require a "is it enabled" logic in Kiali that would add extra complexity.

So, I think we need to review this, but I don't see how Kiali can extend wizards on validations on these new objects just yet.

My recommendation is to limit the scope of this work to listing/editing these objects as a first step.

[hhovsepy]

It seems that Gateway API is not supported yet in https://github.com/kubernetes/client-go/blob/master/kubernetes/clientset.go

[jshaughn]

Taking off the sprint backlog until there is an API we can query for this kind of config.