[ADD] [15.0] account_invoice_discount_date: Early Payment Discount Date

[Shide]

Add early discount date to move lines and invoices as Odoo 17 does.

This module must be deprecated in Odoo 17.

https://www.loom.com/share/13eca4ab1e3d4790938b518eee39a654?sid=eaf99617-a10b-4f36-9d29-036f43aa7e2b

MT-4074 @moduon @rafaelbn @yajo @EmilioPascual please review if you want :)

[rafaelbn]

Designed, worked and reviewed 👍🏼

This PR is the conclusion of a big work and deeply analysed around the new functionality en Odoo 17 for this Stuff (that is great).

https://www.odoo.com/documentation/17.0/es/applications/finance/accounting/customer_invoices/cash_discounts.html

README @Shide is wonderful! Thank you for this lovely work! ❤️

[fcvalgar]

Functional review

LGTM, thank you @Shide

[Gelojr]

LGTM Nice job @Shide
https://www.loom.com/share/104f120a2540477a9d36f06d6940d48c?sid=d454f450-e8ed-4d72-9329-ec285b72b9fc

[yajo]

/ocabot merge patch

[OCA-git-bot]

Sorry @yajo you are not allowed to merge.

To do so you must either have push permissions on the repository, or be a declared maintainer of all modified addons.

If you wish to adopt an addon and become it's maintainer, open a pull request to add your GitHub login to the maintainers key of its manifest.

[rafaelbn]

/ocabot merge patch

[OCA-git-bot]

What a great day to merge this nice PR. Let's do it!
Prepared branch 15.0-ocabot-merge-pr-1625-by-rafaelbn-bump-patch, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at e20f05a. Thanks a lot for contributing to OCA. ❤️