[chat_history] auto-end stream after raid

[kevmo314]

With RealtimeKit, we can now add the ability to automatically end the stream after a raid. Probably the best way to do this would be to add a RealtimeKit to the user's profile and sync some of those settings remotely.

We should do this mostly on the server instead of in the Flutter client, that way it's completely automatic.

[SputNikPlop]

Maybe with the new Helix API endpoints they can implement this feature request https://twitch.uservoice.com/forums/310213-developers/suggestions/45165397-raid-now both could be done.