[scripts] move training and prediction scripts to common packge

doc/api.rst

src/mednet/libs/classification/models/alexnet.py

src/mednet/libs/classification/models/cnn3d.py

src/mednet/libs/classification/models/densenet.py

src/mednet/libs/classification/models/pasa.py

src/mednet/libs/classification/models/typing.py

src/mednet/libs/classification/scripts/cli.py

src/mednet/libs/classification/scripts/evaluate.py

src/mednet/libs/classification/scripts/experiment.py

src/mednet/libs/classification/scripts/predict.py

...dnet/libs/classification/scripts/saliency/completeness.py

src/mednet/libs/classification/scripts/saliency/evaluate.py

src/mednet/libs/classification/scripts/saliency/generate.py

.../libs/classification/scripts/saliency/interpretability.py

src/mednet/libs/classification/scripts/train.py

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

src/mednet/libs/common/models/loss_weights.py

src/mednet/libs/common/models/model.py

src/mednet/libs/common/models/normalizer.py

src/mednet/libs/common/models/typing.py