Add datafusion-cli to the workspace

[andygrove]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
The CLI Cargo.lock is nearly always out of date because the CLI is not part of the workspace. We have to update it periodically.

Why don't we add datafusion-cli to the workspace, as we did recently in Ballista? apache/datafusion-ballista#89

Describe the solution you'd like
Add datafusion-cli to workspace

Describe alternatives you've considered
None

Additional context
None

[alamb]

I think the idea of pinning the Cargo.lock for datafusion-cli was from #2071 / #2112 and @happysalada

I don't have a strong preference to be honest, as I normally run datafusion-cli from my local checkout

[happysalada]

At the time of that PR, the crate had been yanked. If there is no way to get a source with the cargo lock, it makes maintaining for distributions more work.
Ideally there is at least one source with a lockfile.
Feel free to ignore this, as I would personally give priority to ease of maintaining.

[Jefffrey]

Resolved by #14483