Integrate GraphQL schemas

[s1na]

Hey all. Right now the GraphQL spec is frozen. Do you all think this is a good place to put the specs to make them "living" documents instead? In that case I'd be willing to work on that.

[lightclient]

@s1na this would be a great place for it!

[s1na]

I have a first draft here: https://gist.github.com/s1na/77e5d54a9a305244571abc7871fdcbaa
This is an introspection query against geth's GraphQL endpoint. Clients could run the script against their implementation and compare the resulting schema. Because the REST APIs were in JSON I output these schema also in JSON. If a human-readable format is better we could output it in GraphQL's SDL (just like the EIP).

Update: added a file with the schema in SDL to the same gist.