Discogs Add extractor Revised

[elanrosen]

Description of your pull request and other information

Added several changes and additions to the discogs extractor, including error handling, metadata extraction, and checks for DRM-protected and potentially infringing content. It now uses a try-except block to handle exceptions, checks whether the API response contains valid data, and examines the tracklist and media items in the API response to extract additional metadata. The code also uses the sanitize_filename function to generate a safe filename and passes additional metadata to the playlist_result method.

Improvements to #6624

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

[bashonly]

The original PR is still pretty recent, with review comments from only a week ago.

The review comments from the original PR have not been addressed in this PR.

And a lot of the code added in this PR seems pointless or doesn't make sense, e.g. error handling, URL checks, DRM check (all of the video URLs returned by the Discogs API are Youtube links.)

The extra playlist metadata could be useful, but the new metadata extraction code does not follow the project's conventions. Most of it also fails to account for compilations and other "various artists"-type releases.

[bashonly]

Original discogs extractor PR was merged in 6daaf21