Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/filecmp.pyi

@@ -0,0 +1,73 @@
+import sys
+from typing import Any, AnyStr, Callable, Dict, Generic, Iterable, List, Optional, Sequence, Text, Tuple, Union
+
+if sys.version_info >= (3, 6):
+    from os import PathLike
+
+if sys.version_info >= (3, 9):
+    from types import GenericAlias
+
+DEFAULT_IGNORES: List[str]
+
+if sys.version_info >= (3, 6):
+    def cmp(
+        f1: Union[bytes, Text, PathLike[AnyStr]], f2: Union[bytes, Text, PathLike[AnyStr]], shallow: Union[int, bool] = ...
+    ) -> bool: ...
+    def cmpfiles(
+        a: Union[AnyStr, PathLike[AnyStr]],
+        b: Union[AnyStr, PathLike[AnyStr]],
+        common: Iterable[AnyStr],
+        shallow: Union[int, bool] = ...,
+    ) -> Tuple[List[AnyStr], List[AnyStr], List[AnyStr]]: ...
+
+else:
+    def cmp(f1: Union[bytes, Text], f2: Union[bytes, Text], shallow: Union[int, bool] = ...) -> bool: ...
+    def cmpfiles(
+        a: AnyStr, b: AnyStr, common: Iterable[AnyStr], shallow: Union[int, bool] = ...
+    ) -> Tuple[List[AnyStr], List[AnyStr], List[AnyStr]]: ...
+
+class dircmp(Generic[AnyStr]):
+    if sys.version_info >= (3, 6):
+        def __init__(
+            self,
+            a: Union[AnyStr, PathLike[AnyStr]],
+            b: Union[AnyStr, PathLike[AnyStr]],
+            ignore: Optional[Sequence[AnyStr]] = ...,
+            hide: Optional[Sequence[AnyStr]] = ...,
+        ) -> None: ...
+    else:
+        def __init__(
+            self, a: AnyStr, b: AnyStr, ignore: Optional[Sequence[AnyStr]] = ..., hide: Optional[Sequence[AnyStr]] = ...
+        ) -> None: ...
+    left: AnyStr
+    right: AnyStr
+    hide: Sequence[AnyStr]
+    ignore: Sequence[AnyStr]
+    # These properties are created at runtime by __getattr__
+    subdirs: Dict[AnyStr, dircmp[AnyStr]]
+    same_files: List[AnyStr]
+    diff_files: List[AnyStr]
+    funny_files: List[AnyStr]
+    common_dirs: List[AnyStr]
+    common_files: List[AnyStr]
+    common_funny: List[AnyStr]
+    common: List[AnyStr]
+    left_only: List[AnyStr]
+    right_only: List[AnyStr]
+    left_list: List[AnyStr]
+    right_list: List[AnyStr]
+    def report(self) -> None: ...
+    def report_partial_closure(self) -> None: ...
+    def report_full_closure(self) -> None: ...
+    methodmap: Dict[str, Callable[[], None]]
+    def phase0(self) -> None: ...
+    def phase1(self) -> None: ...
+    def phase2(self) -> None: ...
+    def phase3(self) -> None: ...
+    def phase4(self) -> None: ...
+    def phase4_closure(self) -> None: ...
+    if sys.version_info >= (3, 9):
+        def __class_getitem__(cls, item: Any) -> GenericAlias: ...
+
+if sys.version_info >= (3,):
+    def clear_cache() -> None: ...