Add SavedMessages channel type, add create DM.

src/routes/users/mod.rs

@@ -2,10 +2,12 @@ use rocket::Route;
 
 mod fetch_user;
 mod fetch_dms;
+mod open_dm;
 
 pub fn routes() -> Vec<Route> {
     routes! [
         fetch_user::req,
-        fetch_dms::req
+        fetch_dms::req,
+        open_dm::req,
     ]
 }