* refactor(GraphQL): Rename objectId to id
Renames `objectId` to `id` for the GraphQL API. Queries, mutations,
custom and generic types were updated.
Removes `RELATION_INPUT` and `POINTER_INPUT`. Now the user just need
to provide the ID of the object to link.
* fix: Column "id" not found on Postgres
* fix: Avoid deleting Parse class objectId
* fix: Undo objectId removal on mutations
* fix: Handle generic mutation id
* Add a test on deep complex GraphQL Query
* Relation/Pointer new DX + deep nested mutations
* Fix lint
* Review
* Remove unnecessary code
* Fix objectId on update
* GraphQL: Improve session token error message
Fixes the session token related error messages during GraphQL operations. If any authentication error were thrown, it was not correctly handled by the GraphQL express middleware, and ended responding the request with a JSON parsing error.
* Refactor handleError usage
* Use handleParseErrors middleware to handle invalid session token error
* fix: Status code 400 when session token is invalid
* fix: Undo handleParseErrors middleware change