Additional extractor args for youtube

[tcely]

These need more testing.

The documentation is not great with these.

After reading about it in this issue, I need to look into another one:
--extractor-arg "youtube:player_client=web_safari"

The pot plugin also uses an extractor arg:
youtube:getpot_bgutil_baseurl=http://127.0.0.1:4416

Here is an example of setting that using the settings file instead of the yt-dlp flags:

YOUTUBE_DEFAULTS = {
    'extractor_args': {
        'youtube': {
            'getpot_bgutil_baseurl': ['http://127.0.0.1:4416'],
            'formats': ['missing_pot'],
            'max_comments': ['1,all,all,all'],
            'player_client': ['default', 'web_safari'],
            'raise_incomplete_data': ['true'],
        },
        'youtubetab': {'approximate_date': ['true']},
    },
}