Description:

What issue is being seen? Describe what should be happening instead of
the bug, for example: Envoy should not crash, the expected value isn't
returned, etc.

Recently I upgraded the gateway-api to v1.1.0 from the standard channel, but I found that envoy-gateway is in error due to missing some experimental gateway api crds, even though I have not directly used GRPCRoute gateway.networking.k8s.io/v1alpha2 at all.

Make these experimental crds optional could help users to upgrade newer gateway-api releases.

envoy-gateway log:

Error: failed to create provider Kubernetes: failted to create gatewayapi controller: no matches for kind "GRPCRoute" in version "gateway.networking.k
8s.io/v1alpha2"
Usage:
  envoy-gateway server [flags]

Aliases:
  server, serve

Flags:
  -c, --config-path string   The path to the configuration file.
  -h, --help                 help for server

failed to create provider Kubernetes: failted to create gatewayapi controller: no matches for kind "GRPCRoute" in version "gateway.networking.k8s.io/v
1alpha2"

More context: kubernetes-sigs/gateway-api#3075 and the way istio handle it.

Repro steps:

Include sample requests, environment, etc. All data and inputs
required to reproduce the bug.

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sharing.

Environment:

Include the environment like gateway version, envoy version and so on.

Logs:

Include the access logs and the Envoy logs.