[Upstream] Gateway API supports cluster-local Gateway

[carlisia]

Ref.: kubernetes-sigs/gateway-api#1247.

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[dprotaso]

GEP created - kubernetes-sigs/gateway-api#1653

/lifecycle frozen

[dprotaso]

Update - Routability GEP was blocked by sig-network. It's sorta in a limbo because even the K8s community doesn't really know what they want to do and things are in flux.

This 'problem' is currently being lumped into KNI - kubernetes/enhancements#4477