Progress bar *as logger*

[jqnatividad]

Originally posted by @rubdos in #92 (comment)_

Now that #92 is closed, opening a new issue of progress bar as logger.

Fleshing this out a bit more, it would be great if we can use logging messages using some special syntax to:

• pass the record count
• increment progress
• finish progress

It'd be awesome if the progress logger is running on a separate thread to update the progress bar.

This would make it very easy to incorporate indicatif by leveraging logging. I'm partial to leveraging flexi_logger for this as it has async support.

[djc]

This is a little too abstract for me, and I don't think I have any use cases that would require this. Feel free to make more concrete proposals for changes you'd like to make either as a description of a few sentences about the changes you'd like to make or just as a PR.