[extractor/youtube] Define strict uploader metadata mapping (#6384)

New mapping:
```
channel -> channel name
channel_id -> UCID
channel_url -> UCID channel url

uploader -> channel name (same as channel field)
uploader_id -> @handle
uploader_url -> @handle channel url 
```

Authored by: coletdjnz
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coletdjnz 2023-04-14 07:58:36 +00:00 committed by GitHub
parent 93e7c6995e
commit 7666b93604
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