Get pyodide directive working in vscode

[droumis]

According to our user survey, most new users are using vscode for development. This is also true for most of the new contributors to HoloViz. It would be great if there was a way for the pyodide directive to work in a vscode markdown preview. I understand that the work for this would need to be done elsewhere, probably in a vscode plugin, but I'm filing the feature request here as a reminder, as this is the repo where the pyodide directive currently resides.

[philippjfr]

Neat idea!