Add support for ReasonML

[schickling]

In the initial version of graphqlgen (formerly graphql-resolver-codegen) there was a first implementation of ReasonML support. We should bring this functionality back to life 🚀

Would be awesome if someone wants to take a stab at this via a PR 🙏

[czystyl]

Hi @schickling, currently doing ReasonML in my free time so if you would like to hang out and discuss would be great! You can ping me on Prisma Slack as (czysty)

[Weakky]

Hey @czystyl !

I suggest you wait a little bit for #244 to be merged before spending too much time implementing ReasonML. #244 implements a simplified AST to abstract most languages (ReasonML should fit well), allowing us to share lots of common logic between the different languages for code generation and scaffolding 🙌

[samuela]

This would be a huge win for me!

[schickling]

Now that #244 is merged, it would be great if someone wants to pick this up. A first step will be to propose a file/typing layout similar to #115

[czystyl]

I was trying to catch @Weakky on Slack but without result. @schickling can we hang out? It would be awesome to get some information from core team ;)