Support conformance test `HTTPRouteTimeoutRequest`

[randmonkey]

Is there an existing issue for this?

• I have searched the existing issues

Problem Statement

Support extended conformance test HTTPRouteTimeoutRequest added in gateway API 1.0.0-rc1.

Proposed Solution

No response

Additional information

blocked by #4879

Acceptance Criteria

• Passes conformance test HTTPRouteTimeoutRequest.

[tao12345666333]

I think we will be blocked.
Currently, any NGINX-based proxy cannot comply with the specification.

We will cooperate with Upstream and actively explore whether there are other solutions.

ref: kubernetes-sigs/gateway-api#1742