Re-implement scheduler system (check #1321)

src/main/java/emu/grasscutter/server/event/game/ServerTickEvent.java

@@ -1,9 +1,33 @@
 package emu.grasscutter.server.event.game;
 
 import emu.grasscutter.server.event.types.ServerEvent;
+import java.time.Instant;
+
+import java.time.Instant;
 
 public final class ServerTickEvent extends ServerEvent {
-    public ServerTickEvent() {
+    private final Instant start, end;
+
+    public ServerTickEvent(Instant start, Instant end) {
         super(Type.GAME);
+
+        this.start = start;
+        this.end = end;
     }
-}
+
+    public Instant getTickStart() {
+        return this.start;
+    }
+
+    public Instant getTickEnd() {
+        return this.end;
+    }
+
+    public Instant getTickStart() {
+        return this.start;
+    }
+
+    public Instant getTickEnd() {
+        return this.end;
+    }
+}