Option to list and/or switch to featured channels with --user option

[JakobOvrum]

I like to browse videos by channel with the -u option and it's working really well for me. However, sometimes channels have related channels or "subchannels" prominently listed in the "Featured Channels" tab of a channel (e.g. https://www.youtube.com/google/channels), and it would be nice to be able to list them and/or navigate to them from within the TUI for -u. That way there are fewer channel names to remember when invoking youtube-viewer, and it makes browsing a channel more convenient.

I perused all the documentation I could find and I'm really impressed with how much youtube-viewer can do, but I wasn't able to find anything like this. Maybe I didn't look hard enough, in which case I apologize.