Add progress bar

[rrybarczyk]

• file disk reads
• file parsing
• bottleneck finding

[dunxen]

So would we be ok with a crate here, or do we wish to roll our own progress bars?
Was thinking https://github.com/console-rs/indicatif.

[naumenkogs]

I'd suggest implementing something really simple with <10 lines of code for now, and later consider a fancy dependency once we'll have users with opinions.

[dunxen]

I'd suggest implementing something really simple with <10 lines of code for now

Cool, agreed.