OutStream miss `errors` attribute

[frol]

Some tools (for example, distutils) expects sys.stdout / sys.stderr having .errors attribute, but current ipykernel.iostream.OutStream doesn't have it. Is it intended?

Run this in Jupyter Notebook for reproduction:

import sys
sys.stdout.errors

The original issue I hit with distutils is related to Cython pyximport on-the-fly compilation.