[extractor/lbry] Extract original quality formats

[bashonly]

Some videos have their original/source quality format available, which is accessible via GET request to the same URL that the extractor previously only sent a HEAD request to resolve the m3u8 URL.

The format metadata that was previously extracted in the _parse_stream() method was specific to the original format (otherwise format info is/should be extracted from the m3u8), so format metadata extraction has been moved out of that method. (Also cleaned it up with traverse_obj since it was very hard to read before, imo)

Closes #7251

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 dbc8dcb

Summary

🎨🎬✅

Improved the lbry extractor to support more video formats and streamline the code. Refactored yt_dlp/extractor/lbry.py and added a new test case.

We are the extractors of lbry
We parse the streams of doom and despair
We simplify the code of the beast
We test the video of original quality

Walkthrough

• Refactor _parse_stream function to use traverse_obj and return a dictionary with only relevant keys (link)
• Handle direct mp4 streaming URL and append original quality format to formats list in _real_extract function (link, link)
• Simplify _fetch_page function to use yield and return the result of _parse_stream (link)
• Add imports for traverse_obj, url_or_none, urlhandle_detect_ext and urljoin in yt_dlp/extractor/lbry.py (link)
• Remove imports for compat_str and compat_urllib_parse_unquote and use urllib.parse instead in yt_dlp/extractor/lbry.py (link)
• Add test case for video with original quality format in yt_dlp/extractor/lbry.py (link)