Require inner join on offer if sorting by offer

[iworkinprogress]

This PR proposes a change to the API that will automatically join the offer table when trying to sort Objkt by offerPrice or offerCreatedAt.

If the offer table isn't included then trying to use either of those sort options fails and throws a cryptic. It was not immediately clear that you needed to include a filter along with these sort options.

This change should allow this to work (which fails in production):

query {
  generativeToken(id: 20) {
    name
    id
    objkts(sort: {offerCreatedAt: "ASC"}) {
      name
    }
  }
}

Note:

• I had difficulty getting these changes to appear in my development environment for additional testing.