Function orderbook_delta_new 

#[unsafe(no_mangle)]
pub extern "C" fn orderbook_delta_new(
    instrument_id: InstrumentId,
    action: BookAction,
    order: BookOrder,
    flags: u8,
    sequence: u64,
    ts_event: UnixNanos,
    ts_init: UnixNanos,
) -> OrderBookDelta