fix: some compile time errors

Only 174 errors left!

src/service/rooms/metadata/data.rs

@@ -1,3 +1,5 @@
+use ruma::RoomId;
+
 pub trait Data {
     fn exists(&self, room_id: &RoomId) -> Result<bool>;
 }

src/service/rooms/metadata/mod.rs

@@ -1,5 +1,6 @@
 mod data;
 pub use data::Data;
+use ruma::RoomId;
 
 use crate::service::*;