[extractor] Add magentamusik.de

[pwaldhauer]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

The old extractor for magenta-musik-360.de did not work anymore, because the page changed to magentamusik.de and its using HLS stuff now. So I created a new extractor.

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• 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

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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)

Copilot Summary

🤖 Generated by Copilot at 6e6dbeb

Summary

🎵🕸️🇩🇪

Added a new extractor for MagentaMusik and renamed the existing extractor for MagentaMusik 360. This allows downloading videos from both platforms.

magentamusik.py
New extractor for music
Autumn of downloads

Walkthrough

• Add a new extractor for MagentaMusik website (link)
• Rename magentamusik360.py to magentamusik.py to avoid confusion with different platform (link, link)

[pukkandan]

Do not change file or extractor class name. You can add an IE_NAME if desired. Also, the old URLs still seem to work on browser and so support should be kept. Don't remove the tests either. Just fix them and add new ones.

[pwaldhauer]

Do not change file or extractor class name. You can add an IE_NAME if desired. Also, the old URLs still seem to work on browser and so support should be kept. Don't remove the tests either. Just fix them and add new ones.

I created a new one, because the old page is offline. The URLs in the old file do not work anymore. They just redirect to a 404 page. magentamusik.de is a completely new page and replaces the old magenta-musik-360.de page. I don't see how it makes sense to keep the old extractor. I could replace the internals of the old one, and keep the name, if you want, tho.

[pukkandan]

I created a new one, because the old page is offline.

Sorry, idk why I thought the URLs are still working. Maybe I accidentally tried with new URL instead? Or maybe it was when I made the comment and no longer is? Either way, ignore previous review

[seproDev]

Sorry it took so long for someone to take a proper look at this.