[1.0] Move filtering on graphql connections under top-level "filter" key #1174
Description
Should have done this awhile ago but just occurred to me earlier when I was explaining filtering on connections w/ GraphQL that it'd be much easier to understand if all fields you could filter on were under a "filter" key. That way the only top-level keys/fields would be skip, limit, sort, and filter. Much more straightforward to understand.
Also, sortBy should just be sort.
Also add connection fields before node fields as that's generally what you want to query in graphiql.