expand package manager example - parallel progress bars

[solvingj]

I happen to be working on a package manager supporting parallel operations, which is an exceptionally common use case in go (what with goroutines and all). This has made the progress bars very tricky, as I need to show multiple, and append new ones as previous ones finish. I have something working but it's not perfect. I would be very curious to see how bubbletea team would handle a case like this (or anyone else who has done this).

Also, bonus points if you can handle printing log messages in real time after each operation compmletes without breaking the progress bars. It's REALLY hard.