Dynamic properties

[sabas]

@viezel Hi can you please look into updating the trait Item to comply with php 8.2?
Creation of dynamic property EDI\Generator\Orders\Item::$additionalText0 is deprecated
cc @pazion

[pazion]

As class var is created on the fly, workarounbd is to use:
#[\AllowDynamicProperties]

@see src/Generator/Invoic/Item.php

[sabas]

I'd prefer to rework the feature to make it future proof...