[UD] As a User I want to see and manage by domain name on the Account screen

Pre-requirements:
- integration with the Unstoppable Domains API

The updates for the Account screen should be:
- the extension makes a reverse check on the Account screen (checks if the current address has a domain name associated to it)
- if NOT, add new card with text: "_It looks like this address doesn't have a .zil domain name recorded yet._" (replaced the "that" word from the sketch prototype with the work "like" => "It looks like ...") and CTA button "_GET ONE NOW_" which opens in a new tab the partnership link: **_TBD_**
- if YES, add new card "Domain name" which displays the corresponding domain name; the context menu in the top right corner of the card has only one option: "Manage .zil Domain" which opens in a new tab the link: _https://unstoppabledomains.com/domains_ (link towards the user's UD account)

All other existing cards on the Account screen remain (no changes).

Visual updates here: https://www.screencast.com/t/00wUaDqGnoF8