[ie/orf] Add extractor for sound.orf.at podcasts

[Esokrates]

Add orf extractor for podcasts

This adds support for downloading podcasts from https://sound.orf.at/podcast/sender.

Partly Fixes #5265

Template

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)

Copilot Summary

🤖 Generated by Copilot at e50d532

Summary

🎙️🇦🇹➕

Add a new extractor class ORFPodcastIE for ORF podcasts in the orf.py module and register it in the _extractors.py module. This allows yt-dlp to download audio programs from the Austrian public broadcaster.

New ORFPodcastIE
Extracts audio from ORF
Listen in winter

Walkthrough

• Add support for ORF podcasts with a new extractor class (link, link)
  • Define the ORFPodcastIE class in orf.py that inherits from InfoExtractor (link)
  • Implement the _VALID_URL pattern to match the ORF podcast URLs (link)
  • Implement the _TESTS list to provide an example URL and expected metadata (link)
  • Implement the _real_extract method to download the JSON data from the ORF API and extract the audio URL, title, description, duration, and series name (link)
  • Use the clean_html helper function to remove HTML tags from the description (link)
  • Register the new extractor class in the _extractors.py module (link)

[bashonly]

LGTM