🎨 Work on import error handling

- Generic ErrorProducer class
- Importer and managers are error producers
- SGDB Auth friendly error
- Bad source location friendly errors (data, config, cache)
- Removed unused decorators

src/importer/sources/legendary_source.py

@@ -20,7 +20,6 @@
 import json
 import logging
 from json import JSONDecodeError
-from pathlib import Path
 from time import time
 from typing import Generator