implement shopMail giftPackage function

Co-authored-by: Kinesis <CCasusensa@users.noreply.github.com>

src/main/java/emu/grasscutter/data/GameData.java

@@ -62,6 +62,7 @@ public class GameData {
 	private static final Int2ObjectMap<FetterData> fetterDataMap = new Int2ObjectOpenHashMap<>();
 	private static final Int2ObjectMap<FetterCharacterCardData> fetterCharacterCardDataMap = new Int2ObjectOpenHashMap<>();
 	private static final Int2ObjectMap<RewardData> rewardDataMap = new Int2ObjectOpenHashMap<>();
+	private static final Int2ObjectMap<RewardBoxData> rewardBoxDataMap = new Int2ObjectOpenHashMap<>();
 	private static final Int2ObjectMap<WorldLevelData> worldLevelDataMap = new Int2ObjectOpenHashMap<>();
 	private static final Int2ObjectMap<DailyDungeonData> dailyDungeonDataMap = new Int2ObjectOpenHashMap<>();
 	private static final Int2ObjectMap<DungeonData> dungeonDataMap = new Int2ObjectOpenHashMap<>();
@@ -263,6 +264,10 @@ public class GameData {
 		return rewardDataMap;
 	}
 
+	public static Int2ObjectMap<RewardBoxData> getRewardBoxDataMap() {
+		return rewardBoxDataMap;
+	}
+
 	public static Map<Integer, List<Integer>> getFetterDataEntries() {
 		if (fetters.isEmpty()) {
 			fetterDataMap.forEach((k, v) -> {

src/main/java/emu/grasscutter/data/common/RewardBoxItemData.java

@@ -0,0 +1,22 @@
+package emu.grasscutter.data.common;
+
+public class RewardBoxItemData {
+    private int Id;
+    private String Count;
+
+    public int getItemId() {
+        return Id;
+    }
+
+    public void setItemId(int itemId) {
+        Id = itemId;
+    }
+
+    public String getItemCount() {
+        return Count;
+    }
+
+    public void setItemCount(String itemCount) {
+        Count = itemCount;
+    }
+}

src/main/java/emu/grasscutter/data/def/RewardBoxData.java

@@ -0,0 +1,27 @@
+package emu.grasscutter.data.def;
+
+import java.util.List;
+
+import emu.grasscutter.data.GameResource;
+import emu.grasscutter.data.ResourceType;
+import emu.grasscutter.data.common.RewardBoxItemData;
+
+@ResourceType(name = "RewardPreviewExcelConfigData.json")
+public class RewardBoxData extends GameResource {
+    public int Id;
+    public List<RewardBoxItemData> PreviewItems;
+
+    @Override
+    public int getId() {
+        return Id;
+    }
+
+    public List<RewardBoxItemData> getRewardBoxItemList() {
+        return PreviewItems;
+    }
+
+    @Override
+    public void onLoad() {
+
+    }
+}

src/main/java/emu/grasscutter/data/def/ShopGoodsData.java

@@ -30,6 +30,7 @@ public class ShopGoodsData extends GameResource {
     private transient ShopInfo.ShopRefreshType RefreshTypeEnum;
     
     private int RefreshParam;
+    private int ShowId;
 
     @Override
     public void onLoad() {
@@ -105,4 +106,8 @@ public class ShopGoodsData extends GameResource {
     public int getRefreshParam() {
         return RefreshParam;
     }
+
+    public int getShowId() {
+        return ShowId;
+    }
 }