Any examples for Gateway API components?

**Is your feature request related to a problem?**
No examples for correct using Gateways.

**Is your feature request related to a specific Helm chart, if yes mention name of the chart?**
`stable/aws-load-balancer-controller`

**Describe the solution you'd like**
I checked actual examples here: https://kubernetes-sigs.github.io/aws-load-balancer-controller/v3.0/examples/echo_server/#deploy-ingress-for-echoserver
And I see only the `Ingress` option as a variant.

How should I use `gatewayClass` and `Gateway` instead?

Start with the stable/aws-load-balancer-controller chart and the linked echo-server examples, which currently show only an Ingress variant. Determine how the chart should demonstrate GatewayClass and Gateway usage. Done means the repository includes clear Gateway API examples for this chart.

Written by the indexing model from the issue text.