Closes #14312: Move ConfigRevision to core (#14328)

* Move ConfigRevision model & write migrations

* Move ConfigRevision resources from extras to core

* Extend migration to update original content type for ConfigRevision

netbox/core/models/__init__.py

@@ -1,3 +1,4 @@
+from .config import *
 from .contenttypes import *
 from .data import *
 from .files import *