Add a `Location` class (Scene + Position)

src/main/java/emu/grasscutter/utils/Location.java

+package emu.grasscutter.utils;
+
+import dev.morphia.annotations.Entity;
+import dev.morphia.annotations.Transient;
+import emu.grasscutter.game.world.Scene;
+import lombok.Getter;
+import lombok.Setter;
+
+@Entity
+public class Location extends Position {
+    @Transient @Getter @Setter
+    private Scene scene;
+
+    public Location(Scene scene, Position position) {
+        this.set(position);
+
+        this.scene = scene;
+    }
+
+    public Location(Scene scene, float x, float y) {
+        this.set(x, y);
+
+        this.scene = scene;
+    }
+
+    public Location(Scene scene, float x, float y, float z) {
+        this.set(x, y, z);
+
+        this.scene = scene;
+    }
+
+    @Override
+    public Location clone() {
+        return new Location(this.scene, super.clone());
+    }
+
+    @Override
+    public String toString() {
+        return String.format("%s:%s,%s,%s", this.scene.getId(), this.getX(), this.getY(), this.getZ());
+    }
+}
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