#712: Add API to get full result of crafting items

By: James Peters <email@jamesdpeters.com>

paper-api/src/main/java/org/bukkit/inventory/ItemCraftResult.java

@@ -0,0 +1,38 @@
+package org.bukkit.inventory;
+
+import java.util.List;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Container class containing the results of a Crafting event.
+ * <br>
+ * This class makes no guarantees about the nature or mutability of the returned
+ * values.
+ */
+public interface ItemCraftResult {
+
+    /**
+     * The resulting {@link ItemStack} that was crafted.
+     *
+     * @return {@link ItemStack} that was crafted.
+     */
+    @NotNull
+    public ItemStack getResult();
+
+    /**
+     * Gets the resulting matrix from the crafting operation.
+     *
+     * @return resulting matrix
+     */
+    @NotNull
+    public ItemStack[] getResultingMatrix();
+
+    /**
+     * Gets the overflowed items for items that don't fit back into the crafting
+     * matrix.
+     *
+     * @return overflow items
+     */
+    @NotNull
+    public List<ItemStack> getOverflowItems();
+}