Problems with offers for wholesale items

[Pexep]

Describe the bug
There are few problems with offers for wholesale items :

1. when we create an offer for a wholesale item, the default total price is the wholesale price multiplied by the quantity
2. in the offer view, we can't know if the original price is for the entiere quantity or if it's the unit price, it could cause confusion

This supports my suggestion Define price per item for wholesales items.

To Reproduce

1. Create an offer for a wholesale item
2. Look at the offer view

Expected behavior

1. when we create an offer for a wholesale item, the default total price should be the wholesale price
2. in the offer view, we should be able to know if the original price is a wholesale price or a per item price. I suggest to display the original total price :

• for non-wholesale item : the unit price multiplied by the quantity
• for wholesale item : the wholesale price

Server Information (please complete the following information):

• Server version : 1.20.2
• Plugin Version : ??