[ADD] stock: pivot graph for stock forecast

- Task: https://www.odoo.com/web/#id=9161&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.bpogldEeqlHXzCLL
next_id_61 is the parent id which is already  created on stock.