Add option to set Log level between: Info or debug

[cfreds]

Checklist

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2020.03.24
• I've searched the bugtracker for similar feature requests including closed ones

Description

WRITE DESCRIPTION HERE
Can you please add the option to set the log level between: info, debug,
This can be usefull, because the logs can be more small, if we set only "info" and not by default actual "debug".

Actual / Log level debug:
[download] 89.5% of 227.96MiB at 48.21MiB/s ETA 00:00 [download] 91.2% of 227.96MiB at 48.03MiB/s ETA 00:00 [download] 93.0% of 227.96MiB at 48.39MiB/s ETA 00:00 [download] 94.8% of 227.96MiB at 48.25MiB/s ETA 00:00 [download] 96.5% of 227.96MiB at 48.33MiB/s ETA 00:00 [download] 98.3% of 227.96MiB at 48.72MiB/s ETA 00:00 [download] 100.0% of 227.96MiB at 49.09

Future option, with log level info:
2020/04/20 14:36:08 INFO : FileVideo.mp4: Copied (new) 2020/04/20 14:36:08 INFO : Transferred: 96.294M / 96.294 MBytes, 100%, 20.851 MBytes/s, ETA 0s Transferred: 1 / 1, 100% Elapsed time: 4.6s

I hope you can add this feature in the future!

[dstftw]

This is already output on a single line. You either using --newline or your shell does not handle carriage return properly.