add option to scrape any user's playlists

[bharat-nair]

Title

add option to scrape any user's playlist

Description

scrape all public playlists of any user via their profile url. note that the user who is trying to download must authenticate, after which the user can download any public profile. command:

spotdl "https://open.spotify.com/user/<user-id>" --user-auth

Related Issue

#1901

Motivation and Context

provides a feature enhancement

How Has This Been Tested?

tested using a few public profile urls.

Screenshots (if appropriate)

N/A

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have read the CORE VALUES document
• I have added tests to cover my changes
• All new and existing tests passed