Add PlayerPropertyChangeEvent

src/main/java/emu/grasscutter/server/event/player/PlayerPropertyChangeEvent.java

@@ -0,0 +1,23 @@
+package emu.grasscutter.server.event.player;
+
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.game.props.PlayerProperty;
+import emu.grasscutter.server.event.Cancellable;
+import emu.grasscutter.server.event.types.PlayerEvent;
+import lombok.*;
+
+@Getter
+public final class PlayerPropertyChangeEvent extends PlayerEvent implements Cancellable {
+    @Setter private PlayerProperty property;
+    private final int oldValue;
+    @Setter private int newValue;
+
+    public PlayerPropertyChangeEvent(
+            Player player, PlayerProperty property, int oldValue, int newValue) {
+        super(player);
+
+        this.property = property;
+        this.oldValue = oldValue;
+        this.newValue = newValue;
+    }
+}