Re-organize directory structure (#4971)

See discussion in #2491

Co-authored-by: Ivan Levkivskyi <ilevkivskyi@dropbox.com>

stdlib/cgitb.pyi

@@ -0,0 +1,33 @@
+from _typeshed import AnyPath
+from types import FrameType, TracebackType
+from typing import IO, Any, Callable, Dict, List, Optional, Tuple, Type
+
+_ExcInfo = Tuple[Optional[Type[BaseException]], Optional[BaseException], Optional[TracebackType]]
+
+def reset() -> str: ...  # undocumented
+def small(text: str) -> str: ...  # undocumented
+def strong(text: str) -> str: ...  # undocumented
+def grey(text: str) -> str: ...  # undocumented
+def lookup(name: str, frame: FrameType, locals: Dict[str, Any]) -> Tuple[Optional[str], Any]: ...  # undocumented
+def scanvars(
+    reader: Callable[[], bytes], frame: FrameType, locals: Dict[str, Any]
+) -> List[Tuple[str, Optional[str], Any]]: ...  # undocumented
+def html(einfo: _ExcInfo, context: int = ...) -> str: ...
+def text(einfo: _ExcInfo, context: int = ...) -> str: ...
+
+class Hook:  # undocumented
+    def __init__(
+        self,
+        display: int = ...,
+        logdir: Optional[AnyPath] = ...,
+        context: int = ...,
+        file: Optional[IO[str]] = ...,
+        format: str = ...,
+    ) -> None: ...
+    def __call__(
+        self, etype: Optional[Type[BaseException]], evalue: Optional[BaseException], etb: Optional[TracebackType]
+    ) -> None: ...
+    def handle(self, info: Optional[_ExcInfo] = ...) -> None: ...
+
+def handler(info: Optional[_ExcInfo] = ...) -> None: ...
+def enable(display: int = ..., logdir: Optional[AnyPath] = ..., context: int = ..., format: str = ...) -> None: ...