Add Livechat on Livestreams

[Perflyst]

It is probably not possible to write something into the chat, but maybe it is possible to at least see the livechat.

[Perflyst]

On YouTube you can have two different chats, the default is "Top Chat"

[github-actions[bot]]

This issue has been automatically marked as stale and will be closed in 30 days because it has not had recent activity and is much likely outdated. If you think this issue is still relevant and applicable, you just have to post a comment and it will be unmarked.

[TheFrenchGhosty]

Still active, requested here: #1474

[dynameow]

I suggest adding a link directly to popup chat. I assume it would be quite easy to implement and you can even send messages.

[ChunkyProgrammer]

Implenentation wise, I'm guessing something like https://muhammadtriwibowo.medium.com/simple-websocket-using-crystal-13b6f67eba61 can be done to communicate between invidious client and server. Communication between the invidious server and youtube's server can probably take inspiration from youtube.js https://github.com/LuanRT/YouTube.js/blob/main/src/parser/youtube/LiveChat.ts