Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/@python2/gzip.pyi

@@ -0,0 +1,38 @@
+import io
+from typing import IO, Any, Text
+
+class GzipFile(io.BufferedIOBase):
+    myfileobj: Any
+    max_read_chunk: Any
+    mode: Any
+    extrabuf: Any
+    extrasize: Any
+    extrastart: Any
+    name: Any
+    min_readsize: Any
+    compress: Any
+    fileobj: Any
+    offset: Any
+    mtime: Any
+    def __init__(
+        self, filename: str = ..., mode: Text = ..., compresslevel: int = ..., fileobj: IO[str] = ..., mtime: float = ...
+    ) -> None: ...
+    @property
+    def filename(self): ...
+    size: Any
+    crc: Any
+    def write(self, data): ...
+    def read(self, size=...): ...
+    @property
+    def closed(self): ...
+    def close(self): ...
+    def flush(self, zlib_mode=...): ...
+    def fileno(self): ...
+    def rewind(self): ...
+    def readable(self): ...
+    def writable(self): ...
+    def seekable(self): ...
+    def seek(self, offset, whence=...): ...
+    def readline(self, size=...): ...
+
+def open(filename: str, mode: Text = ..., compresslevel: int = ...) -> GzipFile: ...