SPIGOT-7576, #1347: Add methods in MushroomCow to change stew effects

By: Doc <nachito94@msn.com>

paper-server/nms-patches/net/minecraft/world/entity/animal/EntityMushroomCow.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/world/entity/animal/EntityMushroomCow.java
 +++ b/net/minecraft/world/entity/animal/EntityMushroomCow.java
-@@ -42,6 +42,13 @@
+@@ -42,13 +42,20 @@
  import net.minecraft.world.level.block.state.IBlockData;
  import net.minecraft.world.level.gameevent.GameEvent;
  
@@ -14,6 +14,14 @@
  public class EntityMushroomCow extends EntityCow implements IShearable, VariantHolder<EntityMushroomCow.Type> {
  
      private static final DataWatcherObject<String> DATA_TYPE = DataWatcher.defineId(EntityMushroomCow.class, DataWatcherRegistry.STRING);
+     private static final int MUTATE_CHANCE = 1024;
+     private static final String TAG_STEW_EFFECTS = "stew_effects";
+     @Nullable
+-    private List<SuspiciousEffectHolder.a> stewEffects;
++    public List<SuspiciousEffectHolder.a> stewEffects;
+     @Nullable
+     private UUID lastLightningBoltUUID;
+ 
 @@ -114,6 +121,11 @@
              this.playSound(soundeffect, 1.0F, 1.0F);
              return EnumInteractionResult.sidedSuccess(this.level().isClientSide);