papermc serializeAsBytes not implemented for ItemStack

[pontaoski]

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Describe the feature

papermc serializeAsBytes and the corresponding deserializeBytes is not implemented for the MockBukkit ItemStack

==> X OrderSuite.basic serialization  0.074s be.seeseemelk.mockbukkit.UnimplementedOperationException: Not implemented
    at be.seeseemelk.mockbukkit.MockUnsafeValues.serializeItem(MockUnsafeValues.java:260)
    at org.bukkit.inventory.ItemStack.serializeAsBytes(ItemStack.java:726)
    at BallCore.Shops.SellOrderItemDescription.serialize$$anonfun$1(SellOrder.scala:49)
    at scala.Option.foreach(Option.scala:437)
    at BallCore.Shops.SellOrderItemDescription.serialize(SellOrder.scala:50)
    at OrderSuite.$init$$$anonfun$1(OrderSuite.scala:26)