[common] Move reusable files to new common package

src/medbase/__init__.py

src/medbase/data/__init__.py

src/medbase/data/augmentations.py

src/medbase/data/datamodule.py

src/medbase/data/image_utils.py

src/medbase/data/split.py

src/medbase/data/typing.py

src/medbase/engine/__init__.py

src/medbase/engine/callbacks.py

src/medbase/engine/device.py

src/medbase/engine/loggers.py

src/medbase/engine/trainer.py

src/medbase/utils/__init__.py

src/medbase/utils/checkpointer.py

src/medbase/utils/resources.py

src/medbase/utils/summary.py

src/medbase/utils/tensorboard.py

src/mednet/config/data/hivtb/datamodule.py

src/mednet/config/data/indian/datamodule.py

src/mednet/config/data/montgomery/datamodule.py