[RFC] Support interactive output (progress bars, spinners, etc.)

[chshersh]

This is a mega issue for discussing the potential design for interactive elements in the terminal. Ideally, I would like to have something similar to Rust's indicatif library.

Full list of desired features (at least):

• Spinners (for texts with loading icons)
• Progress bars
• Time and memory formatting out-of-the-box for progress bars
• Multiple concurrently updated spinners / progress bars
• Ability to output text above progress bar while progress bar is still running

A single PR doesn't need to implement all of the features at once but a single uniform design for them should be created first to handle various edge and corner cases.

I had an attempt of implementing interactive output in dr-cabal, so some lessons can be learned from this experience. But a complete