Merge in DNS/dnsproxy from 4503-upstream-conf-1 to master

Squashed commit of the following:

commit 959fc034
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Wed May 18 13:17:32 2022 +0200

    proxy: imp code

commit 43f458b0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Wed May 18 11:46:48 2022 +0200

    proxy: imp code

commit bfec0ac0
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue May 17 12:52:27 2022 +0200

    proxy: wildcard default