Closes #5858: Implement a quick-add UI widget for related objects (#18016)

* WIP

* Misc cleanup

* Add warning re: nested quick-adds

netbox/wireless/forms/model_forms.py

@@ -40,7 +40,8 @@ class WirelessLANForm(ScopedForm, TenancyForm, NetBoxModelForm):
     group = DynamicModelChoiceField(
         label=_('Group'),
         queryset=WirelessLANGroup.objects.all(),
-        required=False
+        required=False,
+        quick_add=True
     )
     vlan = DynamicModelChoiceField(
         queryset=VLAN.objects.all(),