Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/http/cookies.pyi

@@ -0,0 +1,39 @@
+import sys
+from typing import Any, Dict, Generic, List, Mapping, Optional, TypeVar, Union, overload
+
+_DataType = Union[str, Mapping[str, Union[str, Morsel[Any]]]]
+_T = TypeVar("_T")
+@overload
+def _quote(str: None) -> None: ...
+@overload
+def _quote(str: str) -> str: ...
+@overload
+def _unquote(str: None) -> None: ...
+@overload
+def _unquote(str: str) -> str: ...
+
+class CookieError(Exception): ...
+
+class Morsel(Dict[str, Any], Generic[_T]):
+    value: str
+    coded_value: _T
+    key: str
+    if sys.version_info >= (3, 7):
+        def set(self, key: str, val: str, coded_val: _T) -> None: ...
+    else:
+        def set(self, key: str, val: str, coded_val: _T, LegalChars: str = ...) -> None: ...
+    def isReservedKey(self, K: str) -> bool: ...
+    def output(self, attrs: Optional[List[str]] = ..., header: str = ...) -> str: ...
+    def js_output(self, attrs: Optional[List[str]] = ...) -> str: ...
+    def OutputString(self, attrs: Optional[List[str]] = ...) -> str: ...
+
+class BaseCookie(Dict[str, Morsel[_T]], Generic[_T]):
+    def __init__(self, input: Optional[_DataType] = ...) -> None: ...
+    def value_decode(self, val: str) -> _T: ...
+    def value_encode(self, val: _T) -> str: ...
+    def output(self, attrs: Optional[List[str]] = ..., header: str = ..., sep: str = ...) -> str: ...
+    def js_output(self, attrs: Optional[List[str]] = ...) -> str: ...
+    def load(self, rawdata: _DataType) -> None: ...
+    def __setitem__(self, key: str, value: Union[str, Morsel[_T]]) -> None: ...
+
+class SimpleCookie(BaseCookie[_T], Generic[_T]): ...