#491: Add support to change block's lid state

By: jameslfc19 <jameslfc19@gmail.com>

paper-api/src/main/java/org/bukkit/block/Lidded.java

@@ -0,0 +1,16 @@
+package org.bukkit.block;
+
+public interface Lidded {
+
+    /**
+     * Sets the block's animated state to open and prevents it from being closed
+     * until {@link #close()} is called.
+     */
+    void open();
+
+    /**
+     * Sets the block's animated state to closed even if a player is currently
+     * viewing this block.
+     */
+    void close();
+}