graphql: Remove extra imports
-use graphql_parser::schema::{Name, Type::NamedType, UnionType, Value, *};
+use graphql_parser::schema::{Name, UnionType, Value, *};
use graphql_parser::Pos;
use inflector::Inflector;
use crate::schema::ast;
-use graph::data::graphql::ext::DocumentExt;
use graph::data::schema::SCHEMA_TYPE_NAME;
use graph::prelude::*;
