Add abstract classes, remove empty conftest.py

[PavelErsh]

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[PavelErsh]

на данный момент падают тесты

FAILED tests/functional/src/test_film.py::test_get_film_details_from_cache - assert 404 == 200
FAILED tests/functional/src/test_genre.py::test_get_genre_details_from_cache - assert 404 == 200
FAILED tests/functional/src/test_person.py::test_get_person_details_from_cache - assert 404 == 200

======================== 3 failed, 14 passed in 22.83s ========================

посмотри пожалуйста код