Add player quit event handler to reset action cooldowns

This change introduces a handler for the PlayerQuitEvent to ensure player action cooldowns are reset when they leave. This prevents potential memory leaks by cleaning up player-specific data in the character controller.

src/main/java/net/thenextlvl/character/plugin/listener/ConnectionListener.java

@@ -10,6 +10,7 @@
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerChangedWorldEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
 import org.jspecify.annotations.NullMarked;
 
 @NullMarked
@@ -25,6 +26,13 @@ public void onPlayerJoin(PlayerJoinEvent event) {
         loadCharacters(event.getPlayer().getWorld(), event.getPlayer());
     }
 
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onPlayerQuit(PlayerQuitEvent event) {
+        plugin.characterController().getCharacters().forEach(character ->
+                character.getActions().values().forEach(action ->
+                        action.resetCooldown(event.getPlayer())));
+    }
+
     @EventHandler(priority = EventPriority.MONITOR)
     public void onPlayerChangedWorld(PlayerChangedWorldEvent event) {
         loadCharacters(event.getPlayer().getWorld(), event.getPlayer());