Feature request: Smile validation

[marceloverdijk]

First of all kudos for this library 👍
As it provides a streaming api approach it's very suitable for large Json/Yaml documents; I tried other similar libraries but I faced some memory issues with large documents as they had to be read in memory completely.

However, it would be great if Justify could support the Smile format. As you might know Smile is a binary serialization format based on JSON.
As Justify already supports both Json and Yaml it might not be that hard to support Smile as well?

[marceloverdijk]

E.g. I could think of a joy-smile module supporting this.