Add option to set item model / custom model data for textures

[MarvinKlar]

It would be awesome, if you could add a way to set the data ITEM_MODEL and CUSTOM_MODEL_DATA for 1.21.x... to support custom textures!
(itemStack.setData(DataComponentTypes.ITEM_MODEL, new NamespacedKey(xxx, xxx)); & itemStack.setData(DataComponentTypes.CUSTOM_MODEL_DATA, CustomModelData.customModelData().addFloat(xxx).addFlag(true).build()))