Function read_bytes_in_chunks 

async fn read_bytes_in_chunks<F, Fut>(
    total_size: usize,
    chunk_size: usize,
    max_in_flight_chunks: usize,
    read_range: F,
) -> Result<Bytes>
where
    F: FnMut(Range<usize>) -> Fut,
    Fut: Future<Output = Result<Bytes>>,