Support ClientTrafficPolicy for TCP Listener

[shuji-2019]

Description:

TCP Listener can't be configured with EnableProxyProtocol / IdleTimeout / ConnectionLimit / PerConnectionBufferLimit, but those fields are already available in ClientTrafficPolicy.

If ClientTrafficPolicy can be attached to TCP Listener, less EnvoyPatchPolicy will be used to extend EG.

[aoledk]

@arkodg In community's plan, does this feature should be implemented after https://github.com/envoyproxy/gateway/issues/1635 refactor is done.

If #1635 is needed, I can work on #1635, if not I can work on this feature.

[arkodg]

yeah we should probably wait on #1635, if you'd like to pick it up, go for it ! there's an existing WIP PR that may need some rebasing

[aoledk]

/assign