feat: Added quest answers

- Added field pending_answers to DiscordConfig
- discord: added /answer

discord/src/main.rs

@@ -35,7 +35,8 @@ async fn main() {
             commands: vec![
                 commands::quest::quest(),
                 commands::register(),
-                commands::init::init()
+                commands::init::init(),
+                commands::answer::answer(),
             ],
             ..Default::default()
         })