Paging with id (token) instead offset number

[raffis]

Describe the change

Support token based paging. We should support to fetch resources from a specific id which is a cursor in this case.

Current situation

Currently paging for all endpoints is supported using offset:x while x is a number.

Should

Offset should accept an id which is most likely the resource id. Since the resource id contains the date/time it is possible to retrieve all resources > _id.

Due backwards compatibility offset should probably accept a number as well.