feat:support custom callopts on client side

Signed-off-by: haoyun <yun.hao@daocloud.io>

client.go

@@ -124,14 +124,17 @@ func New(address string, opts ...ClientOpt) (*Client, error) {
 			grpc.WithConnectParams(connParams),
 			grpc.WithContextDialer(dialer.ContextDialer),
 			grpc.WithReturnConnectionError(),
-
-			// TODO(stevvooe): We may need to allow configuration of this on the client.
-			grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(defaults.DefaultMaxRecvMsgSize)),
-			grpc.WithDefaultCallOptions(grpc.MaxCallSendMsgSize(defaults.DefaultMaxSendMsgSize)),
 		}
 		if len(copts.dialOptions) > 0 {
 			gopts = copts.dialOptions
 		}
+		if len(copts.callOptions) > 0 {
+			gopts = append(gopts, grpc.WithDefaultCallOptions(copts.callOptions...))
+		} else {
+			gopts = append(gopts, grpc.WithDefaultCallOptions(
+				grpc.MaxCallRecvMsgSize(defaults.DefaultMaxRecvMsgSize),
+				grpc.MaxCallSendMsgSize(defaults.DefaultMaxSendMsgSize)))
+		}
 		if copts.defaultns != "" {
 			unary, stream := newNSInterceptors(copts.defaultns)
 			gopts = append(gopts,