[IMP] mrp_multi_level: Add MRP Planner

For each MRP Parameter or for each Product in a MRP Area, we will be able to add a MRP Planner. Once this planner is set, he can filter himself in the MRP Parameters view, MRP Inventory view or MRP Planned Orders view.

mrp_multi_level/models/mrp_inventory.py

@@ -71,6 +71,11 @@ class MrpInventory(models.Model):
         readonly=True,
         store=True,
     )
+    mrp_planner_id = fields.Many2one(
+        related="product_mrp_area_id.mrp_planner_id",
+        readonly=True,
+        store=True,
+    )
 
     def _compute_uom_id(self):
         for rec in self:

mrp_multi_level/models/mrp_planned_order.py

@@ -76,6 +76,11 @@ class MrpPlannedOrder(models.Model):
         "mrp.production", "planned_order_id", string="Manufacturing Orders"
     )
     mo_count = fields.Integer(compute="_compute_mrp_production_count")
+    mrp_planner_id = fields.Many2one(
+        related="product_mrp_area_id.mrp_planner_id",
+        readonly=True,
+        store=True,
+    )
 
     def _compute_mrp_production_count(self):
         for rec in self:

mrp_multi_level/models/product_mrp_area.py

@@ -97,6 +97,7 @@ class ProductMRPArea(models.Model):
         inverse_name="product_mrp_area_id",
         readonly=True,
     )
+    mrp_planner_id = fields.Many2one("res.users")
 
     _sql_constraints = [
         (