osu: make commands aware of user's preferred mode (#54)

* Add preferred_mode to sql database

* Update username and preferred mode

* Make commands aware of preferred mode

* Fetch user extras to display information

* Show user information on forcesave

youmubot-db-sql/migrations/20241030144136_add_preferred_mode_to_osu_users.sql

@@ -0,0 +1,4 @@
+-- Add migration script here
+
+ALTER TABLE osu_users
+  ADD COLUMN preferred_mode INT NOT NULL DEFAULT 0 CHECK (preferred_mode >= 0 AND preferred_mode < 4);