Add back `jupyter nbextension` commands as an alias to `jupyter labextension`?

[jtpio]

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Problem

For some users it might be odd to type the jupyter labextension commands if they only use Jupyter Notebook 7 and not JupyterLab.

Proposed Solution

Maybe it could make sense to add some of the jupyter nbextension commands back to Notebook 7, which would just be an alias for jupyter labextension? For example:

• jupyter nbextension list -> jupyter labextension list
• jupyter nbextension enable -> jupyter labextension enable
• jupyter nbextension disable -> jupyter labextension disable

There might also be some pros for keeping the jupyter labextension command, to explicitly indicate Notebook 7 extensions are JupyterLab extensions.

Although the extensions would still be located under PREFIX/share/labextensions.

Additional context

No strong opinions to add it back. Opening the issue to see if users and / or maintainers would think this could be useful.