[extractor/youtube] Extract channel_is_verified

[coletdjnz]

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Adds new field channel_is_verified

This also fixes and tidies up a few other metadata extraction problems.

Template

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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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• 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 cbe19de

Summary

🛡️📊🎥

This pull request adds new features for YouTube extraction and testing. It enables yt_dlp to get and check the verification status of channels and videos, as well as the heatmap data of videos, from the YouTube platform. It also adds a new attribute channel_is_verified to the InfoExtractor class, which can be used by other extractors as well.

Sing, O Muse, of the skillful coder who devised
A clever way to mark the channels verified
By the mighty YouTube, whose videos he explored
With InfoExtractor, the base class he adored.

Walkthrough

• Add a new attribute channel_is_verified to the InfoExtractor class and its subclasses, which indicates whether the channel that uploaded the video is verified on the platform (link, link, link, link, link)
• Add a new enum value VERIFIED to the BadgeType class, which represents the verified badge that shows a check mark next to the channel name (link)
• Move the definition of the _extract_badges method from the YoutubeBaseInfoExtractor class to the InfoExtractor class, and update the logic to handle different types of badge renderers and labels (link, link, link, link)
• Update the methods that extract information from video, channel, comment, and sidebar renderers to use the _extract_badges method and the VERIFIED badge type, and to set the channel_is_verified attribute accordingly (link, link, link, link)
• Update the test cases for the YoutubeIE, YoutubeTabIE, YoutubeSearchURLIE, and YoutubeConsentRedirectIE classes to include the channel_is_verified, comment_count, and heatmap fields in the expected dictionaries, and to match the current values of the dynamic fields (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Fix a bug where the badge_type variable was used instead of the label_badge_type variable in the _extract_badges method, and add a break statement to exit the loop once a match is found (link)
• Fix a bug where the channel_handle variable could be None in the _extract_channel_renderer method, and try to extract the handle from the subscriberCountText field of the renderer (link)
• Remove an outdated comment from the _extract_channel_renderer method (link)

[pukkandan]

Pls merge as 2 commits. I want the addition of a new field to have its own clean commit. You can first merge all the cleanup except new field.

[pukkandan]

Ans add to readme