Patient $everything operation with _offset query parameter throws exception

[volodymyr-korzh]

$everything operation with _offset query parameter throws exception.

Steps to reproduce:

1. Create Patient.
2. Create 50+ Observations with reference to patient from step 1 (subject.reference = "Patient/123").
3. Register ForceOffsetSearchModeInterceptor
4. Execute $everything operation on patient instance or on patient type:
   GET http://localhost:8000/Patient/1353/$everything or GET http://localhost:8000/Patient/$everything
5. From response above, use execute next link e. g. : http://localhost:8000/Patient/$everything?_count=30&_offset=90
6. See error: HAPI-1106: Everything operation does not support offset searching

Expected behaviour
After executing next link, offset should be applied to response without exception.