Enpoints:
- GET /readinglists/v0/lists/pages: finding lists that contain a given page. Should be tested after creating two lists and putting page A in the first list, page B in the second, and C in both. Shoudl also check what happens when asking for page D.
- GET /readinglists/v0/lists/{id}/entries: list entries in the given list. Test paging!
- DELETE /readinglists/v0/lists/{id}/entries: remove entries from the list. Check be listing entries remaining in the list.
- POST /readinglists/v0/lists/{id}/entries/batch create a batch of list entries