Merge in DNS/dnsproxy from imp-https to master

Squashed commit of the following:

commit bb558cd77742f2cb897b9db14df77e6b2ef877be
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Apr 26 19:58:18 2022 +0300

    proxy: rm subnetdetector

commit f4c34762e675183c96f62f3b8a684fe6758a6b2a
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Apr 26 19:55:50 2022 +0300

    proxy: imp code