Part BOM list now shows how many of each sub-item are available

- If there are enough to build the available quantity is shown in green
- Otherwise, shown in orange

InvenTree/part/serializers.py

@@ -32,6 +32,7 @@ class PartBriefSerializer(serializers.ModelSerializer):
             'url',
             'name',
             'description',
+            'available_stock',
         ]