Add support for FuboTV as AdobePass provider

[tony-izzo]

Checklist

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2020.07.28
• I've searched the bugtracker for similar feature requests including closed ones

Description

WRITE DESCRIPTION HERE

Request to add support for Fubo TV as an AdobePass provider. I was able to implement this in a local branch by adding the following entry to MSO_INFO in youtube_dl/extractor/adobepass.py:

    'FuboTV': {
        'name': 'FuboTV',
        'username_field': 'username',
        'password_field': 'password',
    },

This can be tested by passing --ap-mso FuboTV along with a corresponding username/password (or adding the appropriate flags to ~/.config/youtube/youtube-dl/config).

[tony-izzo]

Note that I used #13938 (which added similar support for AT&T) as a model for my proposed change above.