Support GRPCRoute

[spacewander]

Description

Currently, the GRPCRoute support in istio has a few issues. Let's support it once this feature is mature enough.

Use Scenes

No response

Advice

No response

[spacewander]

This issue is not urgent because we can use HTTPRoute (the service + method is the path) or VirtualService to support gRPC requests. The GRPCRoute is just syntax sugar.

[spacewander]

To support GRPCRoute, we need to upgrade to istio 1.22 first.