Api8/fix itemstack equalTo

[tyhdefu]

At the moment it uses ItemStack.tagMatches but that only compares the nbt, meaning:

ItemStack granite = ItemStack.of(ItemTypes.GRANITE);
ItemStack stone = ItemStack.of(ItemTypes.STONE);
ItemStack oak_plank = ItemStack.of(ItemTypes.OAK_PLANKS);
audience.sendMessage(Component.text("-- .equalTo --"));
audience.sendMessage(Component.text("Granite == Stone -> " + granite.equalTo(stone)));
audience.sendMessage(Component.text("Stone == Granite -> " + stone.equalTo(granite)));
audience.sendMessage(Component.text("Oak plank == Stone -> " + oak_plank.equalTo(stone)));

All yield true.
With this change, all are false, as well comparing the same item yielding true.