Signals: Split signal handler between sync and async

Asyncio requires a closure of the event loop while sync can use SystemExit
to kill the program.

Signed-off-by: kingbri <bdashore3@proton.me>

main.py

@@ -5,6 +5,7 @@ import os
 import pathlib
 import platform
 import signal
+import time
 from loguru import logger
 from typing import Optional