Add pyi to types_or

[mxr]

Ran this on typeshed, spot checked some files, and they seem in order

$ git diff lib/ts_utils/metadata.py | head -n40 | tail
-from typing import Annotated, Any, Final, NamedTuple, final
+from typing import Annotated
+from typing import Any
+from typing import Final
+from typing import final
+from typing import NamedTuple
+
 from typing_extensions import TypeGuard

 if sys.version_info >= (3, 11):

Resolves #247

[asottile]