👑[Enhancement] 添加优选 DoH 的功能

### 🥰 需求描述(Description)

有时总是有几个项目加速有问题，这时就会频繁更换DoH进行测试。
希望在加速之前先自动测试自定义 DoH 默认列表里的 DoH，然后选一个最好的使用。

### 🧐 解决方案(Solution)

### 🚑 其他信息(Other Information)

The issue names no files, tests, or entry points. Start by locating the existing DoH acceleration logic and the custom default DoH list, then determine how providers should be tested and selected; done means the configured list is tested before acceleration and the best provider is used.

Written by the indexing model from the issue text.