Introduce text progress bar

[djmaxus]

Example in Rust for reference:

use std::{io::{self, Write}, thread, time::Duration};

fn main() {
    for i in 0..=100 {
        let width = 40;
        let filled = i * width / 100;
        let empty = width - filled;

        print!(
            "\r[{}{}] {:3}%",
            "#".repeat(filled),
            " ".repeat(empty),
            i
        );
        io::stdout().flush().unwrap();
        thread::sleep(Duration::from_millis(50));
    }
    println!(); // final newline
}