Restructure task bank

adcern/cmd/__init__.py

adcern/cmd/data_mining.py

adcern/cmd/elaborate_scores.py

control_room/airflow-compose/dags/config_variables.py

control_room/airflow-compose/dags/custom_operators.py

control_room/airflow-compose/docker-compose.yml

control_room/airflow-compose/secret.sh

control_room/airflow-compose/start_ad_system.sh

control_room/airflow-compose/task_bank/prepare_start_etl.sh

requirements.txt

setup.cfg

tests/spark_etl/ci_test_script.sh

tests/spark_etl/docker-compose.yml

tests/spark_etl/test_spark_connector.sh