Transform GraphQL query schema into a helper

[VitorLuizC]

graphql-node-api/src/graphql/query.ts

Lines 5 to 11 in 01e3b0f

	const Query = `
	type Query {
	${ commentQueries }
	${ postQueries }
	${ userQueries }
	}
	`

Transform query.ts schema into a helper. This improves readability and scales even with big amount of queries.

export const Query = createQuerySchema(
  commentQueries,
  postQueries,
  userQueries
);