Should not "steal" shift-enter in notebooks

[rehmsen]

Thanks for providing this extension - it is very useful!

One situation where shift-enter is already taken by vanilla VSCode is in notebook files (https://code.visualstudio.com/blogs/2021/11/08/custom-notebooks), where it triggers the "Notebook: Execute Notebook Cell and Select Below" command. This keybinding has been around in IPython for many years, and it very surprising to be overridden there - event more so as the way this extension configures this, it also overrides the shortcut when the cursor is not at all on a comment line.

Would it be an option to extent the when condition to editorTextFocus && !notebookEditorFocused, to avoid stealing the shortcut? I might additionally be useful to add a new, untaken shortcut for "escaping" from a comment in notebooks, maybe one more modifier.

I would be happy to send a change, if you would accept it.