feat(map): 新增英雄卡池卡槽组件HeroBoxComp

1.  新增HeroBoxComp.ts及对应meta配置文件
2.  修改ebox.prefab的spriteFrame为null，适配新组件
3.  组件实现英雄卡基础渲染框架与事件回调逻辑

assets/resources/gui/element/ebox.prefab

@@ -3089,10 +3089,7 @@
       "b": 255,
       "a": 255
     },
-    "_spriteFrame": {
-      "__uuid__": "cb93c900-b440-4571-91d1-7da1636e3d73@fcdc9",
-      "__expectedType__": "cc.SpriteFrame"
-    },
+    "_spriteFrame": null,
     "_type": 0,
     "_fillType": 0,
     "_sizeMode": 0,