ensure `__all__` and `__dir__` are defined on shims

require from `from shim import *` to work properly

IPython/utils/shimmodule.py

@@ -69,6 +69,18 b' class ShimModule(types.ModuleType):'
         """Don't produce __spec__ until requested"""
         return __import__(self._mirror).__spec__
 
+    def __dir__(self):
+        return dir(__import__(self._mirror))
+    
+    @property
+    def __all__(self):
+        """Ensure __all__ is always defined"""
+        mod = __import__(self._mirror)
+        try:
+            return mod.__all__
+        except AttributeError:
+            return [name for name in dir(mod) if not name.startswith('_')]
+
     def __getattr__(self, key):
         # Use the equivalent of import_item(name), see below
         name = "%s.%s" % (self._mirror, key)