[common] (zoom) Adapt to new datasets

common/research/common/dataset/improvement/zoom.py

common/research/common/datasets/image_dataset.py

...n/research/common/datasets/roco/directory_roco_dataset.py

common/research/common/datasets/roco/roco_annotation.py

common/research/common/datasets/roco/roco_datasets.py

common/research/common/datasets/roco/zoo/dji.py

common/research/common/datasets/roco/zoo/dji_zoomed.py

common/research/common/datasets/roco/zoo/twitch.py

common/research/common/scripts/improve_roco_by_zooming.py

common/research/common/scripts/visualize_dataset.py

common/tests/common/unittests/datasets/test_image_dataset.py