What would you like to be added:

Would like to make the conformance/utils/grpc client:

an interface and expose it in the ConformanceOptions: similar to the RoundTripper:

Why this is needed:
This would make it the GRPCRoute tests consistent with the HTTPRoute tests in the conformance suite. This in turn would benefit our implementation (Application Gateway for Containers) to run the conformance suite in environments where the IP address is not directly reachable.