Add celeba, total_bytes

eval/config_celeba.ini

eval/main.ipynb

setup.cfg

src/decentralizepy/communication/Communication.py

src/decentralizepy/communication/TCP.py

src/decentralizepy/datasets/Celeba.py

src/decentralizepy/datasets/Dataset.py

src/decentralizepy/datasets/Femnist.py

src/decentralizepy/node/Node.py