Fine grained notification settings

[linus-ha]

I, as a user, want to be able to disable / enable certain notification types. It currently gets really annoying when there is a notification coming up every few minutes when VS Code does its automated “git fetch”.

~~Besides that: Disabling Notifications from the Gnome control center has no effect. If this is something goldwarden has to implement or if it's a bug on gnomes side is unknown to me.~~ (https://github.com/quexten/goldwarden/issues/182)

Installed as a Flatpak. Version 0.2.13