Set Programmed Condition in Listener Status

[sjberman]

Gateway API prescribes that Programmed condition is present on Gateway resources under the Listener section

https://github.com/kubernetes-sigs/gateway-api/blob/c67f3fd31976ea74ea06a78c2a88ae38df95a41d/apis/v1beta1/gateway_types.go#L838

Acceptance Criteria:

• Implement Programmed condition for Listeners
• Update the docs https://github.com/nginxinc/nginx-kubernetes-gateway/blob/main/docs/gateway-api-compatibility.md#gateway