Add methods to check for conflicting enchantments. Adds BUKKIT-3830

By: GJ <gjmcferrin@gmail.com>

paper-api/src/main/java/org/bukkit/inventory/meta/EnchantmentStorageMeta.java

@@ -61,5 +61,13 @@ public interface EnchantmentStorageMeta extends ItemMeta {
      */
     boolean removeStoredEnchant(Enchantment ench) throws IllegalArgumentException;
 
+    /**
+     * Checks if the specified enchantment conflicts with any enchantments in this ItemMeta.
+     *
+     * @param ench enchantment to test
+     * @return true if the enchantment conflicts, false otherwise
+     */
+    boolean hasConflictingStoredEnchant(Enchantment ench);
+
     EnchantmentStorageMeta clone();
 }

paper-api/src/main/java/org/bukkit/inventory/meta/ItemMeta.java

@@ -107,6 +107,14 @@ public interface ItemMeta extends Cloneable, ConfigurationSerializable {
      */
     boolean removeEnchant(Enchantment ench);
 
+   /**
+    * Checks if the specified enchantment conflicts with any enchantments in this ItemMeta.
+    *
+    * @param ench enchantment to test
+    * @return true if the enchantment conflicts, false otherwise
+    */
+    boolean hasConflictingEnchant(Enchantment ench);
+
     @SuppressWarnings("javadoc")
     ItemMeta clone();
 }