Allow enabling sand duping (#10191)

Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable.

patches/server/0967-Add-Structure-check-API.patch

@@ -0,0 +1,23 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Jake Potrebic <jake.m.potrebic@gmail.com>
+Date: Mon, 27 Mar 2023 10:20:00 -0700
+Subject: [PATCH] Add Structure check API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 263d60cb498f601b1381124127c084efe424409e..18dbaf5d73898756086b94d06d08f8384224709a 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -236,6 +236,12 @@ public class CraftWorld extends CraftRegionAccessor implements World {
+         };
+     }
+     // Paper end
++    // Paper start - structure check API
++    @Override
++    public boolean hasStructureAt(final io.papermc.paper.math.Position position, final Structure structure) {
++        return this.world.structureManager().getStructureWithPieceAt(io.papermc.paper.util.MCUtil.toBlockPos(position), net.minecraft.resources.ResourceKey.create(net.minecraft.core.registries.Registries.STRUCTURE, CraftNamespacedKey.toMinecraft(structure.getKey()))).isValid();
++    }
++    // Paper end
+ 
+     private static final Random rand = new Random();
+