Add back module-level __getattr__ to encodings (#5261)

This is needed for submodules, such as `encodings.cp437`.

pyrightconfig.json

@@ -6,6 +6,7 @@
     ],
     "exclude": [
         "**/@python2",
+        "stdlib/encodings",
         "stdlib/sqlite3/dbapi2.pyi",
         "stdlib/tkinter",
         "stdlib/xml/dom",
@@ -83,4 +84,4 @@
     // Mypy's overlapping overload logic misses these issues (see mypy
     // issue #10143 and #10157).
     "reportOverlappingOverload": "none"
-}
+}

stdlib/encodings/__init__.pyi

@@ -1,7 +1,10 @@
 from codecs import CodecInfo
-from typing import Optional, Union
+from typing import Any, Optional, Union
 
 class CodecRegistryError(LookupError, SystemError): ...
 
 def normalize_encoding(encoding: Union[str, bytes]) -> str: ...
 def search_function(encoding: str) -> Optional[CodecInfo]: ...
+
+# Needed for submodules
+def __getattr__(name: str) -> Any: ...  # incomplete