Add singleton logging configuration for the renamer application

This commit introduces a new module `logging_config.py` that implements a singleton pattern for logging configuration. The logger is initialized only once and can be configured based on an environment variable to log to a file or to the console. This centralizes logging setup and ensures consistent logging behavior throughout the application.

renamer/formatters/special_info_formatter.py

@@ -15,21 +15,15 @@ class SpecialInfoFormatter:
         """Format database info dictionary or tuple/list into a string"""
         import logging
         import os
-        if os.getenv("FORMATTER_LOG"):
-            logging.info(f"format_database_info called with: {database_info!r} (type: {type(database_info)})")
         if isinstance(database_info, dict) and 'name' in database_info and 'id' in database_info:
             db_name = database_info['name']
             db_id = database_info['id']
             result = f"{db_name}id-{db_id}"
-            if os.getenv("FORMATTER_LOG"):
-                logging.info(f"Formatted dict to: {result!r}")
             return result
         elif isinstance(database_info, (tuple, list)) and len(database_info) == 2:
             db_name, db_id = database_info
             result = f"{db_name}id-{db_id}"
-            if os.getenv("FORMATTER_LOG"):
-                logging.info(f"Formatted tuple/list to: {result!r}")
             return result
         if os.getenv("FORMATTER_LOG"):
             logging.info("Returning None")
-        return None
+        return None