Add causal basis extraction stuff back to the CLI somehow

[norabelrose]

Before white-box -> tuned-lens rename, the CLI was like this: white-box lens train <args> and white-box cbe extract <args>

But after the rename we have tuned-lens train <args> without the extra verb. We need to figure out the right way to provide access to the CBE stuff from the CLI now

[AmeenAli]

Any plans for this?

[levmckinney]

Not at the moment.