Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/distutils/version.pyi

@@ -0,0 +1,38 @@
+from abc import abstractmethod
+from typing import Optional, Pattern, Tuple, TypeVar, Union
+
+_T = TypeVar("_T", bound=Version)
+
+class Version:
+    def __repr__(self) -> str: ...
+    def __eq__(self, other: object) -> bool: ...
+    def __lt__(self: _T, other: Union[_T, str]) -> bool: ...
+    def __le__(self: _T, other: Union[_T, str]) -> bool: ...
+    def __gt__(self: _T, other: Union[_T, str]) -> bool: ...
+    def __ge__(self: _T, other: Union[_T, str]) -> bool: ...
+    @abstractmethod
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    @abstractmethod
+    def parse(self: _T, vstring: str) -> _T: ...
+    @abstractmethod
+    def __str__(self) -> str: ...
+    @abstractmethod
+    def _cmp(self: _T, other: Union[_T, str]) -> bool: ...
+
+class StrictVersion(Version):
+    version_re: Pattern[str]
+    version: Tuple[int, int, int]
+    prerelease: Optional[Tuple[str, int]]
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    def parse(self: _T, vstring: str) -> _T: ...
+    def __str__(self) -> str: ...
+    def _cmp(self: _T, other: Union[_T, str]) -> bool: ...
+
+class LooseVersion(Version):
+    component_re: Pattern[str]
+    vstring: str
+    version: Tuple[Union[str, int], ...]
+    def __init__(self, vstring: Optional[str] = ...) -> None: ...
+    def parse(self: _T, vstring: str) -> _T: ...
+    def __str__(self) -> str: ...
+    def _cmp(self: _T, other: Union[_T, str]) -> bool: ...