Enable sqlcmd create to restore dependencies from Jupyter Book, and open book in ADS as single command

[dlevy-msft]

Looking to get around the classic "works on my machine" problem when sharing repros or demos. I want to be able to share a Jupyter notebook that has the necessary metadata for SQLCMD to be able to restore one or more specified backups onto my local instance of SQL running in Docker or Podman.

The main thing we'd need to specify is how should the Jupyter Book yaml add the ability to specify dependencies, so we'd enable something like:

sqlcmd create mssql --use https://aka.ms/sql22-demos.toc

This would copy the Jupyter Book locallly, restore any databases specified in the book metadata, and then load ADS with the Table of Contents and First page (Notebook) displayed.