Keep track of State at event for state resolution

feat: first steps towards joining rooms over federation
Add state-res as a dependency of conduit
Add reverse_topological_power_sort before append_pdu
Implement statehashstatid_pduid tree for keeping track of state
Clean up implementation of state_hash as key for tracking state

src/client_server/room.rs

@@ -315,7 +315,7 @@ pub fn create_room_route(
         db.rooms.set_public(&room_id, true)?;
     }
 
-    Ok(create_room::Response { room_id }.into())
+    Ok(create_room::Response::new(room_id).into())
 }
 
 #[cfg_attr(