Introduce support for Kryo

[gastaldi]

Kryo is a fast and efficient binary object graph serialization framework for Java. The project's goals are high speed, small size, and an easy-to-use API.

https://github.com/EsotericSoftware/kryo

[cowtowncoder]

I am not sure this is feasible, given that Kryo is more a serialization framework of its own, including databinding, and less a general purpose binary format. So I guess the question is what exactly would the goal of a Jackson backend be.

But I'll leave this open just in case someone wants to consider if some support could be added.