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/1041-ItemStack-Tooltip-API.patch

@@ -0,0 +1,29 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Yannick Lamprecht <yannicklamprecht@live.de>
+Date: Mon, 22 Jan 2024 13:27:30 +0100
+Subject: [PATCH] ItemStack Tooltip API
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+index 31d9764b2f6a52088ab7c8f7c0ec41cc7a86846d..1324f05de8106032ce290e928cf106fb4f450517 100644
+--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
++++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+@@ -659,6 +659,18 @@ public final class CraftMagicNumbers implements UnsafeValues {
+         return org.bukkit.craftbukkit.CraftStatistic.getNMSStatistic(statistic).getName();
+     }
+     // Paper end
++    // Paper start - expose itemstack tooltip lines
++    @Override
++    public List<net.kyori.adventure.text.Component> computeTooltipLines(final ItemStack itemStack, final io.papermc.paper.inventory.tooltip.TooltipContext tooltipContext, final org.bukkit.entity.Player player) {
++        Preconditions.checkArgument(tooltipContext != null, "tooltipContext cannot be null");
++        net.minecraft.world.item.TooltipFlag.Default flag = tooltipContext.isAdvanced() ? net.minecraft.world.item.TooltipFlag.ADVANCED : net.minecraft.world.item.TooltipFlag.NORMAL;
++        if (tooltipContext.isCreative()) {
++            flag = flag.asCreative();
++        }
++        final List<net.minecraft.network.chat.Component> lines = CraftItemStack.asNMSCopy(itemStack).getTooltipLines(player == null ? null : ((org.bukkit.craftbukkit.entity.CraftPlayer) player).getHandle(), flag);
++        return lines.stream().map(io.papermc.paper.adventure.PaperAdventure::asAdventure).toList();
++    }
++    // Paper end - expose itemstack tooltip lines
+ 
+     // Paper start - spawn egg color visibility
+     @Override