Function parse_logs_streaming 

pub fn parse_logs_streaming<F>(
    logs: &[String],
    signature: Signature,
    slot: u64,
    block_time: Option<i64>,
    callback: F,
)
where
    F: FnMut(DexEvent),

流式解析日志事件 - 每解析出一个事件就立即回调