Closes #13283: Add context to dropdown options (#15104)

* Initial work on #13283

* Enable passing TomSelect HTML template attibutes on DynamicModelChoiceField

* Merge disabled_indicator into option_attrs

* Add support for annotating a numeric count on dropdown options

* Annotate parent object on relevant fields

* Improve rendering of color options

* Improve rendering of color options

* Rename option_attrs to context

* Expose option context on ObjectVar for custom scripts

* Document dropdown context variables

netbox/dcim/forms/bulk_edit.py

@@ -557,6 +557,9 @@ class DeviceBulkEditForm(NetBoxModelBulkEditForm):
         label=_('Device type'),
         queryset=DeviceType.objects.all(),
         required=False,
+        context={
+            'parent': 'manufacturer',
+        },
         query_params={
             'manufacturer_id': '$manufacturer'
         }
@@ -640,6 +643,9 @@ class ModuleBulkEditForm(NetBoxModelBulkEditForm):
         required=False,
         query_params={
             'manufacturer_id': '$manufacturer'
+        },
+        context={
+            'parent': 'manufacturer',
         }
     )
     status = forms.ChoiceField(