Add support for non-blocking ("async") CBOR parsing

[sdeleuze]

As a followup of FasterXML/jackson-core#57 and SMILE async parsing, it would be great for jackson-dataformat-cbor to provide such support as well.

We would like to leverage such support in Spring WebFlux.

[sdeleuze]

As a follow-up of #127 and because CBOR is the binary data format people are asking the most on Spring side, do you have any insight how hard it would be to support async CBOR parsing ?

[cowtowncoder]

I wouldn't think it overly difficult because of Smile codec that does implement it. There are some differences wrt optional array/object length indicators, but overall CBOR codec is bit less code than Smile one.

I don't really have time to work on this, and it's not part of my day job so there are no current plans to implement it myself.