Adding Support for xiaohongshu.com Website

[Springshen]

describe the feature you'd like to see

With a monthly visitation of 300 million in China, and the expectation of even more traffic in the future, support for this site is of great importance.

additional context

https://www.xiaohongshu.com/

[KwiatekMiki]

https://github.com/imputnet/cobalt/issues/new?assignees=&labels=service+request&projects=&template=service-request.yml&title=add+support+for+%5Bservice+name%5D

[dumbmoron]

from #1055:

link samples

shortlink:
http://xhslink.com/a/HFNEzlEk7tP3

share button copies this, so if cobalt can detect the link from this thatd be cool ig:
88 Kimmich发布了一篇小红书笔记，快来看吧！ 😆 uvdE5BDEqh0P51h 😆 http://xhslink.com/a/HFNEzlEk7tP3，复制本条信息，打开【小红书】App查看精彩内容！

note that share text link contains a ， (not a ,), which social media like Discord parse into the link, and they know this, so they seem to split off everything after ，.

[tizu69]

I just now noticed og:video tag contains the full video link lol