Add UseQuery & UseMutation types

[josemarluedke]

This will allow us to create useXYZQuery functions with pre-defining the types and the query:

export function useMyQuery<
  T extends UseQuery<{ cool: boolean }, { isCool: boolean }>
>(ctx: Object, args?: T['args']): T['return'] {
  return useQuery(ctx, () => [
    gql`
      query {
        myQuery {
          id
        }
      }
    `,
    args ? args() : {}
  ]);
}

class MyComponent extends Component {
  myQuery = useMyQuery(this, () => {
    return { variables: { isCool: true } };
  })
}

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