POC: Creation of a Comm Python package

[martinRenou]

Related discussions:

• https://github.com/jupyter-xeus/xeus-python/issues/342
• https://github.com/jupyter-widgets/ipywidgets/issues/3514

Currently working on a Python comm package on https://github.com/martinRenou/comm for now, but it should probably be moved in the IPython org

This has the benefit of being able to:

• remove the ipykernel dependency in ipywidgets https://github.com/jupyter-widgets/ipywidgets/pull/3533
• remove the ipykernel monkey patch in xeus-python https://github.com/jupyter-xeus/xeus-python/pull/548
• remove the ipykernel package mock in jupyterlite's pyolite
• remove the ipykernel package mock in emscripten-forge