Add NPC interaction system with memory and quest generation

- Introduced a new NPC system with dynamic NPCs and conversation handling.
- Implemented NPC memory using SQLite to log conversations and manage relationships.
- Added commands for talking to NPCs, listing available NPCs, and generating quests.
- Updated database schema to support NPC conversations and relationships.
- Refactored code structure to separate concerns into cogs and handlers.

cogs/xp.py

@@ -241,5 +241,5 @@ class XP(commands.Cog):
         return image_bytes
 
 
-async def setup(client):
+async def setup(client: commands.Bot):
     await client.add_cog(XP(client))