roles: sql, crate, struct, id, rocket id, list page

crates/database/queries/roles/get_all.sql

@@ -0,0 +1,7 @@
+select name,
+       label,
+       created_at  as "created_at: DateTime<Utc>",
+       is_archived as "is_archived: bool"
+from roles
+
+order by created_at desc

crates/database/queries/roles/insert.sql

@@ -0,0 +1,2 @@
+insert into roles (name, label)
+values (?, ?)