Re-organize directory structure (#4971)

See discussion in #2491

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

stdlib/@python2/compileall.pyi

@@ -0,0 +1,16 @@
+from _typeshed import AnyPath
+from typing import Any, Optional, Pattern
+
+# rx can be any object with a 'search' method; once we have Protocols we can change the type
+def compile_dir(
+    dir: AnyPath,
+    maxlevels: int = ...,
+    ddir: Optional[AnyPath] = ...,
+    force: bool = ...,
+    rx: Optional[Pattern[Any]] = ...,
+    quiet: int = ...,
+) -> int: ...
+def compile_file(
+    fullname: AnyPath, ddir: Optional[AnyPath] = ..., force: bool = ..., rx: Optional[Pattern[Any]] = ..., quiet: int = ...
+) -> int: ...
+def compile_path(skip_curdir: bool = ..., maxlevels: int = ..., force: bool = ..., quiet: int = ...) -> int: ...