feat(afk.py): add logging for AFK cog initialization and expiration handler

Add logging statements to provide better visibility into the AFK cog's
initialization process and the start of the AFK expiration handler. This
enhancement aids in debugging and monitoring by clearly indicating when
the AFK cog is initialized and when the expiration handler is started.

Author: kzndotsh

src/tux/modules/utility/afk.py

@@ -39,7 +39,9 @@ def __init__(self, bot: Tux) -> None:
             The bot instance to attach this cog to.
         """
         super().__init__(bot)
+        logger.info("Initializing AFK cog and starting expiration handler")
         self.handle_afk_expiration.start()
+        logger.debug("AFK expiration handler start() called")
 
     async def cog_unload(self) -> None:
         """Cancel the background task when the cog is unloaded."""