Add AnvilView#bypassEnchantmentLevelRestriction

Anvils, by default, limit applied enchantment levels to their respective
maximum level. The added API enables plugins to disable this behaviour,
allowing enchantments that are overleveled to be applied via the anvil.

paper-server/src/main/java/org/bukkit/craftbukkit/inventory/view/CraftAnvilView.java

@@ -50,6 +50,18 @@ public class CraftAnvilView extends CraftInventoryView<AnvilMenu, AnvilInventory
         this.container.maximumRepairCost = cost;
     }
 
+    // Paper start
+    @Override
+    public boolean bypassesEnchantmentLevelRestriction() {
+        return this.container.bypassEnchantmentLevelRestriction;
+    }
+
+    @Override
+    public void bypassEnchantmentLevelRestriction(final boolean bypassEnchantmentLevelRestriction) {
+        this.container.bypassEnchantmentLevelRestriction = bypassEnchantmentLevelRestriction;
+    }
+    // Paper end
+
     public void updateFromLegacy(CraftInventoryAnvil legacy) {
         if (legacy.isRepairCostSet()) {
             this.setRepairCost(legacy.getRepairCost());