Auto-add inferrable meta-categories like "Videos without audio"

[prototyperspective]

• If one has import audio unchecked for a video the hidden meta category "Videos without audio" should be added automatically
• If one has import subtitles checked (default) and it detected some subtitles it should auto add categories like Videos with subtitles in English depending on the lang-code
• Add Videos of 2024 depending on the parsed upload-year. The user can correct/adjust this if inaccurate. For example, it could show a checkbox with "Set category Videos of {upload year}?" that is enabled by default with info showing on hover that the year should be the publication date or the year that the video depicts.
• Add Cat:WebM videos and so on depending on the file-type (these categories currently miss probably most files so sooner or later a bot/script should add these according to the file-type; these are useful for example for petscans)
• See Ask for the video language if audio is imported #191 for language-related categories
• There could be a few more of such inferrable meta-categories

More examples and more details at this bot request (note that even if video2commons adds some categories it wouldn't affect the existing files)