proxy: support HashKV in grpcproxy

proxy/grpcproxy/adapter/maintenance_client_adapter.go

@@ -43,6 +43,10 @@ func (s *mts2mtc) Hash(ctx context.Context, r *pb.HashRequest, opts ...grpc.Call
 	return s.mts.Hash(ctx, r)
 }
 
+func (s *mts2mtc) HashKV(ctx context.Context, r *pb.HashKVRequest, opts ...grpc.CallOption) (*pb.HashKVResponse, error) {
+	return s.mts.HashKV(ctx, r)
+}
+
 func (s *mts2mtc) MoveLeader(ctx context.Context, r *pb.MoveLeaderRequest, opts ...grpc.CallOption) (*pb.MoveLeaderResponse, error) {
 	return s.mts.MoveLeader(ctx, r)
 }

proxy/grpcproxy/maintenance.go

@@ -63,6 +63,11 @@ func (mp *maintenanceProxy) Hash(ctx context.Context, r *pb.HashRequest) (*pb.Ha
 	return pb.NewMaintenanceClient(conn).Hash(ctx, r)
 }
 
+func (mp *maintenanceProxy) HashKV(ctx context.Context, r *pb.HashKVRequest) (*pb.HashKVResponse, error) {
+	conn := mp.client.ActiveConnection()
+	return pb.NewMaintenanceClient(conn).HashKV(ctx, r)
+}
+
 func (mp *maintenanceProxy) Alarm(ctx context.Context, r *pb.AlarmRequest) (*pb.AlarmResponse, error) {
 	conn := mp.client.ActiveConnection()
 	return pb.NewMaintenanceClient(conn).Alarm(ctx, r)