message: Remove unused `debug_dump` functionality of queue
diff: @@ -142,22 +142,6 @@ where
  dumper(&queue_dump);
  }
  - /// Dump the contents of the queues (`Debug` representation) to a given file.
  - pub async fn debug_dump(&self, file: &mut File) -> Result<(), io::Error> {
  - let locks = self.lock_queues().await;
  -
  - let mut writer = BufWriter::new(file);
  - for (kind, guard) in locks {
  - let queue = &*guard;
  - writer.write_all(format!("Queue: {:?} ({}) [\n", kind, queue.len()).as_bytes())?;
  - for event in queue.iter() {
  - writer.write_all(format!("\t{:?}\n", event).as_bytes())?;
  - }
  - writer.write_all(b"]\n")?;
  - }
  - writer.flush()
  - }
  -
  /// Lock all queues in a well-defined order to avoid deadlocks conditions.
  async fn lock_queues(&self) -> Vec<(K, MutexGuard<'_, VecDeque<I>>)> {
  let mut locks = Vec::new();
  