Extend Wrapping Types with additional primitive Tuple

# GraphQL Tuples

At this stage, GraphQL does not provide tuples. This issue proposes to extend the GraphQL specification with an additional primitive type `Tuple` (of kind `WRAPPER`).

a GraphQL tuple `(a₁,...,aₙ₋₁, type)` is a list of fixed size `n`, where the first `n-1` arguments can be either `enum`, `scalar`, or `wrapper` types, but the last argument can take any possible type.
accordingly, the selection will be applied only to the last argument.

For example a API with the following schema for query `{ users { name } }`

```graphql
type User {
name: String
age: Int
}

type Query {
users : [(ID!,User)]
}
```

will produce the response:

```json
{
"data": {
"users": [
["jkgad", { "name": "Alex" }],
["t9t98", { "name": "John" }],
]
}
}
```
this way we can support a `Map` in GraphQL.

Additional considerations of syntax, semantics, and introspection are presented in the [morpheus-graphql-proposals](https://github.com/morpheusgraphql/graphql-proposals/blob/master/proposals/tuples.md)