Update datafusion-cli to support Ballista, or implement new ballista-cli

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
The DataFusion CLI is very handy for demos and testing. It would be nice if we had a similar capability for Ballista.

Describe the solution you'd like
I would like a CLI that works with Ballista.

Describe alternatives you've considered
Add Ballista support to datafusion-cli, or create a new ballista-cli crate.

Additional context
N/A

[alamb]

I think a single CLI would be the best as it reduces the number of crates to keep track of (for users and contributors) as well as makes the close connection of ballista/datafusion apparent.

Thus I would favor extending datafusion-cli to support ballista, though either solution would be fine with me

If we are worried (as I am sometimes) about an unreasonable number of additional dependencies, we could add a ballista rust feature to the datafusion-cli to conditionally include ballista