Enable private broadcast

[kaushalkumar86]

I am using database broadcast in realtime. I followed
https://supabase.com/docs/guides/realtime/authorization?queryGroups=language&language=js#broadcast

It's working fine, but the only thing is I have to set the broadcast channel config private to false in realtime.send.

I couldn't find any option in csharp library to enable broadcast channel configuration private to true.

Please add that.

[diegofesanto]

I'll look into this, may this will need be implemented