[FR] Automatic selection of the best DNS and fragment settings

[coldwater-10]

Feature description

1- An option should be added to the app so that when you activate it, it will take a test from the DNS list to see which one is working correctly, like the SecureDNSClient software.

2- Add an option that when you activate it, it will test different fragment settings and set the best one for that internet automatically.

3- I think it would be great if the personalized rules can be downloaded from the subscription link, like Clash Meta

[TitanComputer]

PR welcomed