Ability to manage userscripts from Web Browser

### Issue Details

It would be great to be able to manage user scripts from the browser. Just like the userscript manager plugins used as browser extensions (violentmonkey, tampermonkey, etc.). We need to go to some websites to configure, control or update the rules of the userscripts and other things.

### Proposed solution

Adding a new "userscript manage" tab to the AdGuard Browser Assistant

### Alternative solution

A userscript specially prepared for this control capability (can be managed from the top right corner of the web page)