enable TCPRoute to use HAProxy v2 protocol to communicate with the backend

[eltorio]

For gateway API (≥ v0.5.1)

New annotation in TCPRoute

apiVersion: gateway.networking.k8s.io/v1alpha2
kind: TCPRoute
metadata:
  annotations:
    haproxy.org/send-proxy-v2: 'true'

this will enable to use HAProxy v2 protocol to communicate with the backend this is useful for transmitting the original IP of the remote client.