Consider Usage of BanID instead of Ban

Hello,

In case a user is offline, their ban will not be recorded by using the `ban` command, we should consider the usage of the `banid` command with the users name if available. I'll do a PR later if I'm able to and you're okay with this change. 

https://github.com/dassjosh/Rust.DiscordSignLogger/blob/main/DiscordSignLogger.cs#L1420

Ref: https://www.corrosionhour.com/rust-ban-command/