static GrpcJsonMarshallerBuilder builder() {
        return new GrpcJsonMarshallerBuilder();
    }
Returns a new {@link GrpcJsonMarshallerBuilder}. This implementation internally uses
<a href="https://github.com/curioswitch/protobuf-jackson">protobuf-jackson</a>
to serialize and deserialize messages.
grpc/src/main/java/com/linecorp/armeria/common/grpc/GrpcJsonMarshaller.java