api: add spawn time to tileitem

runelite-api/src/main/java/net/runelite/api/TileItem.java

@@ -36,4 +36,10 @@ public interface TileItem extends Renderable
 	int getId();
 
 	int getQuantity();
+
+	/**
+	 * Time in game ticks when the item spawned (relative to us)
+	 * @return
+	 */
+	int getSpawnTime();
 }