[tests] Add tests for drive database

src/mednet/libs/classification/tests/__init__.py

src/mednet/libs/classification/tests/conftest.py

src/mednet/libs/common/tests/__init__.py

src/mednet/libs/common/tests/conftest.py

src/mednet/libs/segmentation/tests/__init__.py

src/mednet/libs/segmentation/tests/conftest.py

...ata/histograms/models/histograms_lwnet_drive_default.json

...ts/data/histograms/raw_data/histograms_drive_default.json

src/mednet/libs/segmentation/tests/test_drive.py