[19.0][ADD] account_supplier_early_payment_discount: early payment discount of the supplier settled by a credit note

[alan196]

New module account_supplier_early_payment_discount.

Suppliers often grant a discount when their bills are paid within a few days, and many of them settle it with a credit note of their own that reaches the company weeks later, if ever. This module keeps that discount on the supplier and on its bills, takes it when the bill is paid in time, and follows up the credit note the supplier owes.

• Early payment terms on the supplier: up to two chained discounts (2 % and then 1 % take 2.98 %, not 3 %), the days to pay within, and whether they count from the invoice date or from the receipt of the goods.
• On the vendor bill: the last day to pay to earn the discount and what the discount takes off.
• Apply Early Payment: posts an internal credit note for the discount (a proportional reversal, so taxes follow) and reconciles it with the bill, so what is left to pay is the net amount.
• Follow-up: the internal credit note raises a to-do for the Early Payment Credit Notes activity team (mail_activity_team), made of the users of the new group Follow Up Early Payment Credit Notes, until the credit note of the supplier arrives. Accounting managers have the group by default.
• account.move._early_payment_pay_date() gives the business day the discount is paid on (the business day before when the date falls on a weekend or a holiday of the working calendar of the company). The payment order integration is a separate module, account_payment_order_early_payment_discount, proposed in OCA/bank-payment.

Why not the native early payment discount of the payment terms? It knows a single discount counted from the invoice date and books it as a write-off when the payment is registered. Here there are two chained discounts, a base on the receipt date, a credit note because the supplier issues one, and someone chasing it.

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Codecov Report

❌ Patch coverage is 95.85799% with 7 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (19.0@5804fc1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...lier_early_payment_discount/models/account_move.py	91.80%	3 Missing and 2 partials ⚠️
...plier_early_payment_discount/models/res_company.py	89.47%	1 Missing and 1 partial ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##             19.0      #11   +/-   ##
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  Coverage        ?   91.25%           
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  Files           ?       78           
  Lines           ?     2035           
  Branches        ?      230           
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  Partials        ?       89           

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