Pattern notification feature

[Kuinox]

Feature proposed on discord post: https://discord.com/channels/143867839282020352/1009481124512272446

You can give feedback on existing code, especially EFCore parts as I never used EFCore.

Ping me on discord if you pick it up to finish it, I don't mind if you do so.

On which channel modix should listen for the patterns ?
It can't be all channels: you can exfiltrate private messages by doing a catch-all pattern.