[ADD][16.0] Sale Margin Update

[ljimenezsidoo]

This module adds a wizard that enables users to recalculate the unit price of products on a sale order line based on a specified margin percentage. It allows recalculating the sale price dynamically to ensure the desired profit margin is achieved.

• Margin-based Price Adjustment: Users can specify a margin percentage to calculate and set the product's sale price according to that margin.

• Negative and High Margin Constraints: The module includes validation to prevent negative margins and margins equal to or greater than 100%.

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖

[rrebollo]

@ljimenezsidoo can U review mine in exchange #3380 ?

[ljimenezsidoo]

@rousseldenis Thank you for the review! I’ve made all the requested changes.