add a graphical progress bar to `app start` and `app stop`

[lucarin91]

We already have a progress event, but we just print it to the console

arduino-app-cli/cmd/arduino-app-cli/app/start.go

Line 72 in 5be93c5

fmt.Fprintf(out, "Progress[%s]: %.0f%%\n", message.GetProgress().Name, message.GetProgress().Progress)

. We could add a graphical top or buttom bar updated with that percentage