[T5371][ADD] fields 'document_type_id', 'vat' and...

Merged Javier Vescio requested to merge T5371 into 15.0

[T5371][ADD] fields 'document_type_id', 'vat' and 'property_account_position_id' can be set as required using 'special_partner_required_fields' field from 'res.config.settings' model

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