Add fuel related methods to BrewingStand API

By: lapry <lapry34@gmail.com>

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

@@ -22,5 +22,19 @@ public interface BrewingStand extends BlockState, InventoryHolder {
      */
     void setBrewingTime(int brewTime);
 
+    /**
+     * Get the level of current fuel for brewing.
+     *
+     * @return The fuel level
+     */
+    int getFuelLevel();
+
+    /**
+     * Set the level of current fuel for brewing.
+     *
+     * @param level fuel level
+     */
+    void setFuelLevel(int level);
+
     public BrewerInventory getInventory();
 }

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

@@ -1,5 +1,6 @@
 package org.bukkit.inventory;
 
+import org.bukkit.Material;
 import org.bukkit.block.BrewingStand;
 
 /**
@@ -21,5 +22,20 @@ public interface BrewerInventory extends Inventory {
      */
     void setIngredient(ItemStack ingredient);
 
+    /**
+     * Get the current fuel for brewing.
+     *
+     * @return The fuel
+     */
+    ItemStack getFuel();
+
+    /**
+     * Set the current fuel for brewing. Generally only
+     * {@link Material#BLAZE_POWDER} will be of use.
+     *
+     * @param fuel The fuel
+     */
+    void setFuel(ItemStack fuel);
+
     BrewingStand getHolder();
 }