Added events for endermen pickup/placement blocks and methods to get/set the block that an enderman is holding. Thanks Wizjany

By: Wizjany <wizjany@gmail.com>

paper-api/src/main/java/org/bukkit/entity/Enderman.java

@@ -1,6 +1,23 @@
 package org.bukkit.entity;
 
+import org.bukkit.material.MaterialData;
+
 /**
  * Represents an Enderman.
  */
-public interface Enderman extends Monster {}
+public interface Enderman extends Monster {
+
+    /**
+     * Get the id and data of the block that the Enderman is carrying.
+     *
+     * @return MaterialData containing the id and data of the block
+     */
+    public MaterialData getCarriedMaterial();
+
+    /**
+     * Set the id and data of the block that the Enderman is carring.
+     *
+     * @param material data to set the carried block to
+     */
+    public void setCarriedMaterial(MaterialData material);
+}