Allow parser to generate type definition from GraphQL type format

[Horusiath]

Given the GraphQL type format definition, maybe it's good idea to allow parser to parse them into FSharp.Data.GraphQL compatible type definition schema. Later this could be used to generate full types by the type provider.

Example:

interface Character {
 id: String!
 name: String
 friends: [Character]
 appearsIn: [Episode]
}

type Droid implements Character {
 id: String!
 name: String
 friends: [Character]
 appearsIn: [Episode]
 primaryFunction: String
 id: String!
 name: String
 friends: [Character]
 appearsIn: [Episode]
}

enum Episode {
 NEWHOPE
 EMPIRE
 JEDI
}

type Human implements Character {
 id: String!
 name: String
 friends: [Character]
 appearsIn: [Episode]
 homePlanet: String
 id: String!
 name: String
 friends: [Character]
 appearsIn: [Episode]
}

type Query {
 hero(episode: Episode): Character!
 human(id: String!): Human
 droid(id: String!): Droid!
}