Function parse_order_updated 

pub fn parse_order_updated(
    msg: &DeribitOrderMsg,
    instrument: &InstrumentAny,
    account_id: AccountId,
    trader_id: TraderId,
    strategy_id: StrategyId,
    ts_init: UnixNanos,
) -> OrderUpdated

Parses a Deribit order message into an OrderUpdated event.

This should be called when an order is amended (price or quantity changed).