[IMP] l10n_it_edi_pa: Split Payment

New module is created (`l10n_it_edi_pa`) to add fields that are required to handle Split Payment, and it will be merged in master.

- `l10n_it_origin_document_type`
- `l10n_it_origin_document_date`
- `l10n_it_origin_document_name`
- `l10n_it_cup`
- `l10n_it_cig`

These fields are required to track money used that comes from funding to the Public Administration business for purchases, be it ordinary or project based spending.
They also need to be exported in XML during the EDI phase, in different
XML nodes depending on the `l10n_it_origin_document_type` field

ref: https://fex-app.com/FatturaElettronica/FatturaElettronicaBody/DatiGenerali/DatiOrdineAcquisto
Task link: https://www.odoo.com/web#id=2823645&model=project.task
task-2823645

Part-of: odoo/odoo#132026