Add CLI Command to auto-generate config file

[isabella]

No description provided.

[tbillington]

I got a basic version working by logging out the columns as part of the config while a model is being trained. Obviously not production ready but served my purpose! I briefly looked at outputting the rest of the config but it seemed like it would require either refactoring or a much better understanding of the codebase than I have.

tangramdotdev/tangram@main...tbillington:main

[MitchyGoodness]

Here's an updated link to tbillington's proposal: compare main to tbillington:main

Sorry to butt in, I was just checking out the issues, tried the link, and found it pointed to the repo's old address.