DNS rewrites UI improvements

[binaryfire]

Hi

First of all, thanks for your work on this great project. I've started using AdGuard's DNS rewrites for assigning domains to my all my local development apps. The UX isn't the best once the list gets long. It'd be great if you could implement the following:

1. Search box to find specific entries
2. Remember the last used sorting option, perhaps in the session (eg. domain -> ascending)