Interface for serialized messages

[atimin]

We're developing a bridge that will receive and store serialised data in its original form in a database. This patch enables that functionality. I didn't put much effort into it as it's generated code. However, if the team sees value in this feature, I can develop it further.

Thank you for the awesome library!

[atimin]

Looks like there is another PR doing the same: #592. Please, ignore this one.

[esteve]

@atimin no problem! Were you able to try the approach in #592 ? Does it work for you?

[atimin]

Hey @esteve, I tried to adopt the code from #592. It doesn't work in my environment. I need more time to investigate why. It may be the way I've integrated it.

However, I can see that my patch adheres to the project API style and uses callbacks. I've already tested it in a production environment, processing thousands of messages per second with no issues. Would you prefer to use my work?

In any case, I'm open to collaborating on both approaches.