[IMP] stock,mrp,purchase: split _run method and move it to rules

Previously mrp, stock and purchase used _run methon on procurement
group and start with a if checking for the action type. This commit
instead launch a specific method depending the rule's action's type

Also _run method and their submethod used in procurement group
was always called with a rule. Thus we choose to move this method
on the rule object himself.

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