Create files from Grasscutter-Quests

these files are NOT directly compatible with Grasscutter, and require additional modifications to the codebase to work.

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

@@ -0,0 +1,8 @@
+package emu.grasscutter.data.common;
+
+import java.util.List;
+
+public interface BaseTrialActivityData {
+    List<Integer> getAvatarIndexIdList();
+    List<Integer> getRewardIdList();
+}