Command line method for converting .ipynb to .NET console project

[jonsequitur]

Emitting a console project would enable publishing a "notebook" as an ordinary console application.

Specific variables within the notebook should be able to be exposed as command line options to enable runtime parameterization.

Related: #483, #890

[WhiteBlackGoose]

Something as simple as

dotnet new console
rm program.cs
jupyter nbconvert --to script notebook.ipynb
move notebook.cs program.cs

[jonsequitur]

We'll probably want it to be supported directly, e.g.

> dotnet-interactive publish --format csproj --source /path/to/my.ipynb --destination /path/to/output/folder

We'll want to generate a Main method that defines command line options corresponding to variables in the notebook that have been identified as parameterizable. Those values then have to be populated in the kernel(s) that we create.

needs to be able to work for notebooks containing multiple languages.

[brettfo]

A related scenario of converting a .ipynb notebook to a .dib via the command line would also be immensely useful.

[jonsequitur]

See: #482.