Closes #16127: Enable loading local settings

Author: jeremystretch

netbox/netbox/settings.py

@@ -801,3 +801,10 @@ def _setting(name, default=None):
     RQ_QUEUES.update({
         f"{plugin_name}.{queue}": RQ_PARAMS for queue in plugin_config.queues
     })
+
+# UNSUPPORTED FUNCTIONALITY: Import any local overrides.
+try:
+    from .local_settings import *
+    _UNSUPPORTED_SETTINGS = True
+except ImportError:
+    pass