[kemonoparty] Comments metadata

[God-damnit-all]

Back when yiff.party was a thing, some artists would post download URLs as the first comment, since those weren't scraped. That's probably the main reason kemono.party bothers with them with its scraper, but currently, gallery-dl doesn't retrieve them.

[mikf]

kemono.party doesn't include any comments in its API responses (example), otherwise they would already be included in gallery-dl's metadata, and I do not know if it is possible or how to enable them.

I also don't want to start scraping kemono's HTML pages. We should ask the kemono devs to add this functionality to their API or how to use it if it's already there.