Reapply "Merge branch 'f-review-lists-and-compare' into 'dev'"

CHANGELOG.md

src/doc/tutorials/complex_data_models.rst

src/linkahead/__init__.py

src/linkahead/apiutils.py

src/linkahead/cached.py

src/linkahead/common/models.py

unittests/test_apiutils.py

unittests/test_entity.py