Support autofill of 2FA codes when logging in

[MineGene]

Issue Details

When logging in with an Apple ID and with 2FA enabled, AdGuard prompts for the 2FA code when logging in.
Unfortunately, AdGuard is not yet supporting iOS autofill of 2FA codes unlike most other websites, automatically or via the autofill button.

This means you have to manually open the passwords app, navigate to your AdGuard credentials, copy the 2FA code, and switch back to the app which is quite inconvenient in this day and age.

Proposed solution

Support 2FA autofill IAW Apple’s documentation.

Alternative solution

No response

[maxikuzmin]

@MineGene thank you! We'll improve this in future updates