Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/asyncio/queues.pyi

@@ -0,0 +1,36 @@
+import sys
+from asyncio.events import AbstractEventLoop
+from typing import Any, Generic, Optional, TypeVar
+
+if sys.version_info >= (3, 9):
+    from types import GenericAlias
+
+class QueueEmpty(Exception): ...
+class QueueFull(Exception): ...
+
+_T = TypeVar("_T")
+
+class Queue(Generic[_T]):
+    def __init__(self, maxsize: int = ..., *, loop: Optional[AbstractEventLoop] = ...) -> None: ...
+    def _init(self, maxsize: int) -> None: ...
+    def _get(self) -> _T: ...
+    def _put(self, item: _T) -> None: ...
+    def __repr__(self) -> str: ...
+    def __str__(self) -> str: ...
+    def _format(self) -> str: ...
+    def qsize(self) -> int: ...
+    @property
+    def maxsize(self) -> int: ...
+    def empty(self) -> bool: ...
+    def full(self) -> bool: ...
+    async def put(self, item: _T) -> None: ...
+    def put_nowait(self, item: _T) -> None: ...
+    async def get(self) -> _T: ...
+    def get_nowait(self) -> _T: ...
+    async def join(self) -> None: ...
+    def task_done(self) -> None: ...
+    if sys.version_info >= (3, 9):
+        def __class_getitem__(cls, type: Any) -> GenericAlias: ...
+
+class PriorityQueue(Queue[_T]): ...
+class LifoQueue(Queue[_T]): ...