feat: projection with * key request all fields from database

By default `graphql-compose-mongoose` requests that fields which are
listed in the graphql query. So you may want to add some `rawData` field
to your type for debug/administrative purposes in such way:
```js
UserTC.addFields({
  rawData: {
    type: 'JSON',
    resolve: (source, args, context) => (context.isAdmin() ?
source.toJSON() : null),
    projection: { '*': true },
  },
});
```

Author: nodkz