message: explort that function to allow writing Message::Bytes manually
diff: @@ -28,7 +28,7 @@ pub enum MessageType {
  }
  impl MessageType {
  #[inline]
  - fn encode_with<T>(&self, cbor: &T) -> Bytes
  + pub fn encode_with<T>(&self, cbor: &T) -> Bytes
  where
  T: se::Serialize,
  {
  