Incorporate `python_db_logger`

[michael-bentz]

Add python_db_logger to Nacculator:

• Add an example.env with the necessary DB_* environment variables
• Add a local mysql container definition. Copy the folder structure (.containers/mysql) and docker-compose.yml from python_db_logger
• Update README with instructions on how to start the docker container
• Add python_db_logger as a dependency in setup.py:

install_requires=[
      "python_db_logger @ git+ssh://git@github.com:/ctsit/python_db_logger.git"
  ]

• Create a configure_logging function similar to https://github.com/ctsit/ufvivo-pubingest/blob/0779cf62b41245c479ebf49a9233d77bd644ab58/ufvivo/pubingest/__main__.py#L89-L111 that also creates an instance of DBLogger
• Replace all calls to print with db_logger.print_info() , db_logger.print_warn() , etc.