Add stub for codeop to 2and3 (#1534)

stdlib/2and3/codeop.pyi

@@ -0,0 +1,17 @@
+# Source(py2): https://hg.python.org/cpython/file/2.7/Lib/codeop.py
+# Source(py3): https://github.com/python/cpython/blob/master/Lib/codeop.py
+
+from types import CodeType
+from typing import Optional
+
+def compile_command(source: str, filename: str = ..., symbol: str = ...) -> Optional[CodeType]: ...
+
+class Compile:
+    flags = ...  # type: int
+    def __init__(self) -> None: ...
+    def __call__(self, source: str, filename: str, symbol: str) -> CodeType: ...
+
+class CommandCompiler:
+    compiler = ...  # type: Compile
+    def __init__(self) -> None: ...
+    def __call__(self, source: str, filename: str = ..., symbol: str = ...) -> Optional[CodeType]: ...