Function parse_log 

pub fn parse_log(
    log: &str,
    signature: Signature,
    slot: u64,
    tx_index: u64,
    block_time_us: Option<i64>,
    grpc_recv_us: i64,
    is_created_buy: bool,
) -> Option<DexEvent>

主解析函数 (极限优化版本)

性能目标: <100ns