Adding GEP-3539: Gateway API to Expose Pods on Cluster-Internal IP Address (ClusterIP Gateway)

[ptrivedi]

Signed-off-by: Pooja Trivedi [email protected]

What type of PR is this?

/kind gep

What this PR does / why we need it:

This defines via documentation how Gateway API can be used to accomplish ClusterIP Service behavior. It also proposes DNS record format for ClusterIP Gateway, proposes an EndpointSelector resource, and briefly touches upon Gateway API usage to define LoadBalancer and NodePort behaviors.

Which issue(s) this PR fixes:

Fixes #3539

Does this PR introduce a user-facing change?:

NONE

[linux-foundation-easycla]

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• ✅ login: ptrivedi / name: Pooja Trivedi (6a061ca)

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[k8s-ci-robot]

Hi @ptrivedi. Thanks for your PR.

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