[API] Query improvements (#11034)

* Improve prefetch fields for API

* Cache ContentType queryset for getModelsWithMixin

- Called a LOT of times for an options request
- Store the list in the session cache
- Much faster than redis - and expires after the session is complete

* Skip optional prefetch for options requests

* Custom implementation of DjangoModelPermission

- Cache the queryset against the view
- Prevents multiple hits for OPTIONS request
- Saves > 100ms on /stock/ options request

src/backend/InvenTree/company/serializers.py

@@ -268,7 +268,11 @@ class ManufacturerPartSerializer(
             source='part', many=False, read_only=True, allow_null=True
         ),
         True,
-        prefetch_fields=['part'],
+        prefetch_fields=[
+            Prefetch(
+                'part', queryset=part.models.Part.objects.select_related('pricing_data')
+            )
+        ],
     )
 
     pretty_name = enable_filter(