Function query_crypto_order_related_fills 

pub async fn query_crypto_order_related_fills(
    backend: &BackendConn,
    acc_id: u64,
    trd_cache: &TrdCache,
    order_id_ex: &str,
) -> Result<Vec<OrderFillInfo>>

Query fills for one crypto order through CMD20624.

C++ 10.5.6508 NNProto_Trd_DealCrypto.cpp:500-529 sends inbound_read::OrderFillDetailReq with crypto msg header, order id, page size 500, and follows page_flag until completed=true.