allow graphql operators in filter query

[GraemeFulton]

GraphQL filters such as _and, _or or _not throws a permissions issue: "You don't have permission to filter model Letter by the following fields: $and. Field is not readable or do not exist." it looks like it's being treated as a field?

to reproduce issue, try an _and query, something like this in /api/graphql:

query {
  vulcanUsers(
    input: { filter: { _and: [{ _id: { _eq: "61ccb24e536dde646bdb3080" } }] } }
  ) {
    results {
      _id
    }
  }
}

This patch will check if the permissions diff is an graphQl operator, and allow the query to continue if so.

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[eric-burel]

I think the issue is upper: the "fields" array should not contain the operators in the first place, but a list of all the fields in the selector (including nested ones). Also, I am not sure why we do this check against the actual Mongo selector ($and) and not the Graphql selector (_and) but there might be a good reason (like handling views/parameters)

[eric-burel]

Solved in 0.4.11, the default query resolver was getting the wrong fields to test