Update type hints in CoreLogger constructor for better clarity

.gitignore

@@ -1 +1,2 @@
 .venv
+__pycache__/

core/logger/core_logger.py

@@ -3,6 +3,7 @@ import sys
 from enum import Enum
 from logging import Formatter, LogRecord, getLogger, StreamHandler, FileHandler
 from pathlib import Path
+from typing import Optional
 
 from colorama import Fore, Style
 
@@ -35,8 +36,8 @@ class CoreLogger:
         self,
         name: str = "app",
         level: str = "INFO",
-        fmt: str = None,
-        datefmt: str = None,
+        fmt: Optional[str] = None,
+        datefmt: Optional[str] = None,
         log_to_console: bool = True,
         log_to_file: bool = False,
     ):