Port saliency map generation/analysis to new name

doc/api.rst

src/mednet/engine/saliency/__init__.py

src/mednet/engine/saliency/completeness.py

src/mednet/engine/saliency/evaluator.py

src/mednet/engine/saliency/generator.py

src/mednet/engine/saliency/interpretability.py

src/mednet/engine/saliency/viewer.py

src/mednet/scripts/saliency/__init__.py

src/mednet/scripts/saliency/completeness.py

src/mednet/scripts/saliency/evaluate.py

src/mednet/scripts/saliency/generate.py

src/mednet/scripts/saliency/interpretability.py

src/mednet/scripts/saliency/view.py

tests/test_cli.py

tests/test_saliencymap_evaluator.py