update the extractor to support the general IGN video pages

[ghost]

Checklist

• [x] I'm reporting a site feature request
• [x] I've verified that I'm running youtube-dl version 2021.06.06
• [x] I've searched the bugtracker for similar site feature requests including closed ones

Description

example pages:

https://www.ign.com/videos?filter=trailers (from https://www.ign.com/videos) https://www.ign.com/videos/series/ign-game-reviews (from https://www.ign.com/videos/series/)

The former is an "endless" lazy-loading page, the latter requires more user-input (clicking on 'view next').

command output:

youtube-dl https://www.ign.com/videos?filter=trailers

[generic] videos?filter=trailers: Requesting header
WARNING: Falling back on generic information extractor.
[generic] videos?filter=trailers: Downloading webpage
[generic] videos?filter=trailers: Extracting information
ERROR: Unsupported URL: https://www.ign.com/videos?filter=trailers

youtube-dl https://www.ign.com/videos/series/ign-game-reviews

[ign.com] series: Downloading JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 404: Not Found (caused by <HTTPError 404: 'Not Found'>)

[dirkf]

Same: https://github.com/yt-dlp/yt-dlp/issues/1741