message: Remove `Pong` from `Command`
diff: @@ -232,7 +232,6 @@ pub enum Command {
  max: Option<u64>,
  },
  Ping,
  - Pong,
  Flush {
  result: oneshot::Sender<io::Result<()>>,
  },
  @@ -760,11 +759,6 @@ impl ConnectionHandler {
  self.handle_reconnect().await?;
  }
  }
  - Command::Pong => {
  - while let Err(err) = self.connection.write_op(ClientOp::Ping).await {
  - self.handle_reconnect().await?;
  - }
  - }
  Command::Flush { result } => {
  if let Err(err) = self.connection.write_op(ClientOp::Flush { result }).await {
  self.handle_reconnect().await?;
  