Added visit count | 获取并增加访问计数

[EasyChris]

// 获取并增加访问计数
    let count = await LINKS.get(path + "_count");
    if (count === null) {
      await LINKS.put(path + "_count", "1"); // 初始化为1，因为这是首次访问
    } else {
      count = parseInt(count) + 1;
      await LINKS.put(path + "_count", count.toString());
    }

把访问次数 以 key_count 的形式存储在kv里面，方便看特定的访问数据

[qazxcdswe123]

Please at least remove the self-plug URL before opening this PR 😃

[crazypeace]

已合并到 https://github.com/crazypeace/url-Shorten-Worker/

并在 EasyChris 的基础上做了一些优化
修改说明 https://zelikk.blogspot.com/2023/11/url-shorten-worker-visit-count-api-api.html
演示视频 https://www.youtube.com/watch?v=wxP3PBShS2U