[IMP] stock, product_expiry: Improve the traceability of the products

PURPOSE
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Improve the traceability of the products.

1. If you have an issue with a serial or lot number, you want to easily find from which supplier it's coming and to which customer it has been delivered, to contact them in case of problem.

2. We have the possibility to define expiration dates on products but the users are not informed when this date is reached. Now we can easily inform them with the next activities.

SPECIFICATIONS
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1. Locate precisely a SN/LN (find to which customer it has been delivered and from which supplier it's coming from)
Add fields "Purchase Orders" and "Sale Orders" (must be a many2many) and displays PO's and SO's related to this LN/SN.

2. Log a next activity for the product responsible when expiration date is reached for a product [OK]
- Check the alert_date on the stock.production.lot, if the date is in the past or today, log a next activity on the stock.production.lot
- Assigned to = the product responsible
- Due date = today
- Activity = Alert Date Reached
- Text = The alert date has been reached for this lot/serial number.
- Raise a next activity only for products that are still in stock = that are in a location of type internal.
- This cron checking the alert dates should be added in the existing scheduler cron
- The next activity is only create one time for the each lot. If a next activity has already be create for this lot previously, next activity will not be create again.

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