Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/zipimport.pyi

@@ -0,0 +1,30 @@
+import os
+import sys
+from types import CodeType, ModuleType
+from typing import Any, List, Optional, Tuple, Union
+
+if sys.version_info >= (3, 7):
+    from importlib.abc import ResourceReader
+
+class ZipImportError(ImportError): ...
+
+class zipimporter(object):
+    archive: str
+    prefix: str
+    if sys.version_info >= (3, 6):
+        def __init__(self, path: Union[str, bytes, os.PathLike[Any]]) -> None: ...
+    else:
+        def __init__(self, path: Union[str, bytes]) -> None: ...
+    if sys.version_info >= (3,):
+        def find_loader(
+            self, fullname: str, path: Optional[str] = ...
+        ) -> Tuple[Optional[zipimporter], List[str]]: ...  # undocumented
+    def find_module(self, fullname: str, path: Optional[str] = ...) -> Optional[zipimporter]: ...
+    def get_code(self, fullname: str) -> CodeType: ...
+    def get_data(self, pathname: str) -> str: ...
+    def get_filename(self, fullname: str) -> str: ...
+    if sys.version_info >= (3, 7):
+        def get_resource_reader(self, fullname: str) -> Optional[ResourceReader]: ...  # undocumented
+    def get_source(self, fullname: str) -> Optional[str]: ...
+    def is_package(self, fullname: str) -> bool: ...
+    def load_module(self, fullname: str) -> ModuleType: ...