Add respawn API.

By: ninja- <xninja@openmailbox.org>

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

@@ -2301,6 +2301,13 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
         public InetSocketAddress getRawAddress() {
             throw new UnsupportedOperationException("Not supported yet.");
         }
+
+        /**
+         * Respawns the player if dead.
+         */
+        public void respawn() {
+            throw new UnsupportedOperationException("Not supported yet.");
+        }
     }
 
     @NotNull