Progress bar terminal task bar support

[zkat]

You can use an escape sequence to show progress in the Windows Terminal task bar, as well as other terminals that support it: https://mastodon.social/@zadjii/110419658574135851

[zkat]

I looked into doing this a bit, and while the trivial case of having an "indeterminate" state is easy, having more precise progress will require a change in either indicatif or tracing-indicatif. I've created an issue in the former in hopes that they're into the idea: console-rs/indicatif#596

Until then, I'm just gonna add an "indeterminate" state.