Isolating the graphql-go backend from sturgeon

[iamshreeram]

Just a thought - I'm not sure if this is possible or If there a way to do this - can we isolate the back-end used by Sturgeon?

Idea is, Sturgeon would be a wrapper on top of the core (graphql-go or gql-gen). User should be able to choose the backend they need. If users don't choose any, we can default it to graphql-go.

I have created couple of GQL servers, completely written on top of gql-gen and I find it to be promising (on bootstrapping and performance).

@mewil