refactor(lombok): add Getter where possible

src/main/java/emu/grasscutter/game/inventory/ItemDef.java

@@ -1,5 +1,8 @@
 package emu.grasscutter.game.inventory;
 
+import lombok.Getter;
+
+@Getter
 public class ItemDef {
     private int itemId;
     private int count;
@@ -9,18 +12,10 @@ public class ItemDef {
         this.count = count;
     }
 
-    public int getItemId() {
-        return itemId;
-    }
-
     public void setItemId(int itemId) {
         this.itemId = itemId;
     }
 
-    public int getCount() {
-        return count;
-    }
-
     public void setCount(int count) {
         this.count = count;
     }