[ptbench.models.pasa] Define new API for modules

src/ptbench/configs/models/pasa.py

src/ptbench/models/alexnet.py

src/ptbench/models/densenet.py

src/ptbench/models/loss_weights.py

src/ptbench/models/normalizer.py

src/ptbench/models/pasa.py

src/ptbench/utils/save_sh_command.py