Update to Minecraft 1.17

By: md_5 <git@md-5.net>

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

@@ -0,0 +1,40 @@
+package org.bukkit.inventory.meta;
+
+import java.util.List;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+public interface BundleMeta extends ItemMeta {
+
+    /**
+     * Returns whether the item has any items.
+     *
+     * @return whether items are present
+     */
+    boolean hasItems();
+
+    /**
+     * Returns an immutable list of the items stored in this item.
+     *
+     * @return items
+     */
+    @NotNull
+    List<ItemStack> getItems();
+
+    /**
+     * Sets the items stored in this item.
+     *
+     * Removes all items when given null.
+     *
+     * @param items the items to set
+     */
+    void setItems(@Nullable List<ItemStack> items);
+
+    /**
+     * Adds an item to this item.
+     *
+     * @param item item to add
+     */
+    void addItem(@NotNull ItemStack item);
+}