Add a "sales_order" reference to the Build model

- If a build order is made to fulfil a sales order
- Add sales_order filtering to the Build API
- Pass initial information through to the BuildCreate view

InvenTree/build/serializers.py

@@ -39,6 +39,7 @@ class BuildSerializer(InvenTreeModelSerializer):
             'completion_date',
             'part',
             'part_detail',
+            'sales_order',
             'quantity',
             'status',
             'status_text',