Function order_emulated_new

#[no_mangle]
pub extern "C" fn order_emulated_new(
    trader_id: TraderId,
    strategy_id: StrategyId,
    instrument_id: InstrumentId,
    client_order_id: ClientOrderId,
    event_id: UUID4,
    ts_event: UnixNanos,
    ts_init: UnixNanos,
) -> OrderEmulated