[cli] Add, document and test experiment CLI

bob/ip/binseg/configs/datasets/__init__.py

bob/ip/binseg/configs/datasets/chasedb1/covd.py

bob/ip/binseg/configs/datasets/chasedb1/ssl.py

bob/ip/binseg/configs/datasets/drive/covd.py

bob/ip/binseg/configs/datasets/drive/ssl.py

bob/ip/binseg/configs/datasets/hrf/covd.py

bob/ip/binseg/configs/datasets/hrf/ssl.py

bob/ip/binseg/configs/datasets/iostar/covd.py

bob/ip/binseg/configs/datasets/iostar/ssl.py

bob/ip/binseg/configs/datasets/stare/covd.py

bob/ip/binseg/configs/datasets/stare/ssl.py

bob/ip/binseg/data/utils.py

bob/ip/binseg/engine/ssltrainer.py

bob/ip/binseg/engine/trainer.py

bob/ip/binseg/script/evaluate.py

bob/ip/binseg/script/experiment.py

bob/ip/binseg/script/predict.py

bob/ip/binseg/script/train.py

bob/ip/binseg/test/test_cli.py

bob/ip/binseg/test/test_config.py