Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/email/utils.pyi

@@ -0,0 +1,40 @@
+import datetime
+import sys
+from email.charset import Charset
+from typing import List, Optional, Tuple, Union, overload
+
+_ParamType = Union[str, Tuple[Optional[str], Optional[str], str]]
+_PDTZ = Tuple[int, int, int, int, int, int, int, int, int, Optional[int]]
+
+def quote(str: str) -> str: ...
+def unquote(str: str) -> str: ...
+def parseaddr(address: Optional[str]) -> Tuple[str, str]: ...
+def formataddr(pair: Tuple[Optional[str], str], charset: Union[str, Charset] = ...) -> str: ...
+def getaddresses(fieldvalues: List[str]) -> List[Tuple[str, str]]: ...
+@overload
+def parsedate(date: None) -> None: ...
+@overload
+def parsedate(date: str) -> Optional[Tuple[int, int, int, int, int, int, int, int, int]]: ...
+@overload
+def parsedate_tz(date: None) -> None: ...
+@overload
+def parsedate_tz(date: str) -> Optional[_PDTZ]: ...
+
+if sys.version_info >= (3, 10):
+    @overload
+    def parsedate_to_datetime(date: None) -> None: ...
+    @overload
+    def parsedate_to_datetime(date: str) -> datetime.datetime: ...
+
+else:
+    def parsedate_to_datetime(date: str) -> datetime.datetime: ...
+
+def mktime_tz(tuple: _PDTZ) -> int: ...
+def formatdate(timeval: Optional[float] = ..., localtime: bool = ..., usegmt: bool = ...) -> str: ...
+def format_datetime(dt: datetime.datetime, usegmt: bool = ...) -> str: ...
+def localtime(dt: Optional[datetime.datetime] = ...) -> datetime.datetime: ...
+def make_msgid(idstring: Optional[str] = ..., domain: Optional[str] = ...) -> str: ...
+def decode_rfc2231(s: str) -> Tuple[Optional[str], Optional[str], str]: ...
+def encode_rfc2231(s: str, charset: Optional[str] = ..., language: Optional[str] = ...) -> str: ...
+def collapse_rfc2231_value(value: _ParamType, errors: str = ..., fallback_charset: str = ...) -> str: ...
+def decode_params(params: List[Tuple[str, str]]) -> List[Tuple[str, _ParamType]]: ...