[MRP] Allow disassembling through manufacturing orders

Hello,

Task: [MRP] allow disassembling through manufacturing orders

In the Manufacturing Order, allow to use negative quantities in the Product Quantity field so that the selected product is dismantled and individual components are put back into inventory, with all appropriate stock moves.

More details:
https://www.odoo.com/web#id=5241&view_type=form&model=project.task&menu_id=3942&action=327
https://pad.odoo.com/p/r.Vquhp9c9xsuPRWaX

Thanks,
JPR