6347 Cache the number of each component type assigned to devices/VMs (#12632)

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/netbox/models/__init__.py

@@ -8,6 +8,7 @@ from netbox.models.features import *
 from utilities.mptt import TreeManager
 from utilities.querysets import RestrictedQuerySet
 
+
 __all__ = (
     'ChangeLoggedModel',
     'NestedGroupModel',

netbox/netbox/registry.py

@@ -21,6 +21,7 @@ class Registry(dict):
 
 # Initialize the global registry
 registry = Registry({
+    'counter_fields': collections.defaultdict(dict),
     'data_backends': dict(),
     'denormalized_fields': collections.defaultdict(list),
     'model_features': dict(),