feat: Added new pet upgrade recipe framework

src/main/java/io/github/moulberry/repo/NEURepository.java

@@ -41,6 +41,7 @@ public final class NEURepository {
                             .registerSubtype(NEUMobDropRecipe.class, "drops")
                             .registerSubtype(NEUNpcShopRecipe.class, "npc_shop")
                             .registerSubtype(NEUKatUpgradeRecipe.class, "katgrade")
+                            .registerSubtype(NEUDirectPetUpgradeRecipe.class, "direct_pet_upgrade")
                             .setFallbackType(NEUUnknownRecipe.class)
                             .setDefaultTypeTag("crafting")
             )

src/main/java/io/github/moulberry/repo/data/NEUDirectPetUpgradeRecipe.java

@@ -0,0 +1,39 @@
+package io.github.moulberry.repo.data;
+
+import lombok.Getter;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public class NEUDirectPetUpgradeRecipe implements NEURecipe {
+    /**
+     * Base pet.
+     */
+    @Getter
+    NEUIngredient input;
+    /**
+     * Upgraded pet.
+     */
+    @Getter
+    NEUIngredient output;
+    /**
+     * Item you need to upgrade, not including the pet itself.
+     */
+    @Getter
+    NEUIngredient item;
+
+    @Override
+    public Collection<NEUIngredient> getAllInputs() {
+        List<NEUIngredient> inputs = new ArrayList<>();
+        inputs.add(input);
+        inputs.add(item);
+        return inputs;
+    }
+
+    @Override
+    public Collection<NEUIngredient> getAllOutputs() {
+        return Collections.singleton(output);
+    }
+}