This pull request implements updates for Dutch payroll calculations, including new tax rules and wage categories. The changes focus on improving accuracy and compliance with local regulations, particularly related to special wages and salary rules. This work is in progress and requires further testing.

This update introduces a new integration with Intervat and MyMinfin, specifically designed for Belgian companies. Intervat allows users to electronically submit VAT declarations, while MyMinfin enables them to download supporting documents after submissions. This improves compliance and reporting for our Belgian customers.

This commit ad new EDI integration for Intervat and MyMinfin api's, usable only for Belgian companies.

Intervat: this api is used to send electronic vat declarations.

MyMinfin: this api is used after a declaration submission, it allow the user to fetch and download files (pdf & xml) from previous submitted declarations.

Linked: https://github.com/odoo/odoo/pull/221070

task-4624148

Forward-Port-Of: odoo/enterprise#84533