Add ability to copy app version in About in AdGuard VPN

[rakleed]

Issue Details

In order for the user to send a version number to support or when creating an issue on GitHub, he needs to manually enter the version number, which is not convenient.

Proposed solution

Add the ability to copy the app version in the About section of the settings.

Alternative solution

No response

[Aydinv13]

@rakleed ,

that's quite a useful request. I've created another one for Ad Blocker. Thank you.