Refactoring of the 'CachedDataSink' class

beat/backend/python/algorithm.py

beat/backend/python/data.py

beat/backend/python/dataformat.py

beat/backend/python/dbexecution.py

beat/backend/python/executor.py

beat/backend/python/helpers.py

beat/backend/python/library.py

beat/backend/python/message_handler.py

beat/backend/python/outputs.py

beat/backend/python/test/test_algorithm.py

beat/backend/python/test/test_data.py

beat/backend/python/test/test_data_loaders.py

beat/backend/python/test/test_dbexecution.py

beat/backend/python/test/test_message_handler.py

beat/backend/python/utils.py