Support spawn NPC

src/main/java/emu/grasscutter/data/custom/SceneNpcBornData.java

@@ -0,0 +1,28 @@
+package emu.grasscutter.data.custom;
+
+import ch.ethz.globis.phtree.PhTree;
+import emu.grasscutter.scripts.data.SceneGroup;
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.experimental.FieldDefaults;
+
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Data
+@FieldDefaults(level = AccessLevel.PRIVATE)
+public class SceneNpcBornData {
+    int sceneId;
+    List<SceneNpcBornEntry> bornPosList;
+
+    /**
+     * Spatial Index For NPC
+     */
+    transient PhTree<SceneNpcBornEntry> index;
+
+    /**
+     * npc groups
+     */
+    transient Map<Integer, SceneGroup> groups = new ConcurrentHashMap<>();
+}