Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/reprlib.pyi

@@ -0,0 +1,36 @@
+from array import array
+from typing import Any, Callable, Deque, Dict, FrozenSet, List, Set, Tuple
+
+_ReprFunc = Callable[[Any], str]
+
+def recursive_repr(fillvalue: str = ...) -> Callable[[_ReprFunc], _ReprFunc]: ...
+
+class Repr:
+    maxlevel: int
+    maxdict: int
+    maxlist: int
+    maxtuple: int
+    maxset: int
+    maxfrozenset: int
+    maxdeque: int
+    maxarray: int
+    maxlong: int
+    maxstring: int
+    maxother: int
+    def __init__(self) -> None: ...
+    def repr(self, x: Any) -> str: ...
+    def repr1(self, x: Any, level: int) -> str: ...
+    def repr_tuple(self, x: Tuple[Any, ...], level: int) -> str: ...
+    def repr_list(self, x: List[Any], level: int) -> str: ...
+    def repr_array(self, x: array[Any], level: int) -> str: ...
+    def repr_set(self, x: Set[Any], level: int) -> str: ...
+    def repr_frozenset(self, x: FrozenSet[Any], level: int) -> str: ...
+    def repr_deque(self, x: Deque[Any], level: int) -> str: ...
+    def repr_dict(self, x: Dict[Any, Any], level: int) -> str: ...
+    def repr_str(self, x: str, level: int) -> str: ...
+    def repr_int(self, x: int, level: int) -> str: ...
+    def repr_instance(self, x: Any, level: int) -> str: ...
+
+aRepr: Repr
+
+def repr(x: object) -> str: ...