implement the activity system

src/main/java/emu/grasscutter/data/excels/ActivityWatcherData.java

@@ -0,0 +1,36 @@
+package emu.grasscutter.data.excels;
+
+import emu.grasscutter.data.GameResource;
+import emu.grasscutter.data.ResourceType;
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.experimental.FieldDefaults;
+
+import java.util.List;
+
+@ResourceType(name = "NewActivityWatcherConfigData.json", loadPriority = ResourceType.LoadPriority.HIGH)
+@Getter
+@FieldDefaults(level = AccessLevel.PRIVATE)
+public class ActivityWatcherData extends GameResource {
+    int id;
+    int rewardID;
+    int progress;
+    WatcherTrigger triggerConfig;
+
+    @Override
+    public int getId() {
+        return this.id;
+    }
+    @Override
+    public void onLoad() {
+        triggerConfig.paramList = triggerConfig.paramList.stream().filter(x -> !x.isBlank()).toList();
+    }
+
+    @Getter
+    @FieldDefaults(level = AccessLevel.PRIVATE)
+    public static class WatcherTrigger{
+        String triggerType;
+        List<String> paramList;
+    }
+
+}