Add support for dolt/dolthub

If the feature request is for a plugin or theme, specify it here.

Theme (supporting git and/or dolt)

If the feature solves a problem you have, specify it here.

The feature is about supporting dolt which is basically a git for data.

Describe the proposed feature.

I was thinking of theme support that allows you to see info about the state of changes in the data. Something like the info we got from the Agnoster theme for a git folder, but for a dolt folder. Yet, I would like to have Agnoster (git) and dolt info together in a single theme that could identify whether it is a git folder or a dolt folder.

Describe alternatives you've considered

Alternative, I was thinking of a plugin allowing autocomplete some of the commands from dolt-cli

Additional context

I would pin this discussion about this missing feature.

Related Issues

Yes, I opened an issue before I found this template for feature requests

Thank you.