Add bindings to the wat-desugar tool

[kritzcreek]

Would you take a PR that adds bindings to the wat-desugar tool? https://webassembly.github.io/wabt/doc/wat-desugar.1.html

I've never written bindings to a C library, but I'd give it a try and ask for guidance if I get stuck if these bindings are something you'd like to have.

[pepyakin]

Would you take a PR that adds bindings to the wat-desugar tool?

Yeah sure!

I've never written bindings to a C library, but I'd give it a try and ask for guidance if I get stuck if these bindings are something you'd like to have.

That's alright, if you have any question feel free to ask it.