feat: 下载时考虑 backup_url，支持按照 cdn 优先级排序 #288
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b 站下载链接返回时会包含一个 baseUrl 和两个 backupUrl，之前只会尝试访问 baseUrl。
新的实现会将三个 url 统一作视为视频的下载链接，并依次尝试下载。
默认情况下，url 的请求顺序是 baseUrl -> backupUrl。该 PR 同时引入了 cdn_sorting 配置，默认为 false。如果启用，三个 url 会按照如下优先级进行排序：
