Pull request 1991: AG-25392 confmigrate vol.2

Merge in DNS/adguard-home from AG-25392-confmigrate-vol.2 to master

Squashed commit of the following:

commit 7bcdf44
Merge: 4c25331 f84ff2b
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 20:33:08 2023 +0300

    Merge branch 'master' into AG-25392-confmigrate-vol.2

commit 4c25331
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 20:14:23 2023 +0300

    confmigrate: fix fmt

commit d7dbfc4
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 20:07:25 2023 +0300

    confmigrate: imp code

commit cd29729
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 18:21:14 2023 +0300

    confmigrate: imp code, split files

commit f075a14
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 17:19:47 2023 +0300

    confmigrate: imp code

commit 3733559
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 16:54:13 2023 +0300

    confmigrate: imp code, docs

commit 1df0ddc
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Sep 4 14:41:52 2023 +0300

    all: add testdata

commit e62690d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Aug 31 16:13:14 2023 +0300

    all: imp code

commit 0934d59
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Aug 30 15:50:52 2023 +0300

    home: don't reread config

commit 7566ab6
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Aug 30 15:43:57 2023 +0300

    all: imp code

commit 6f6aae6
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Aug 30 15:25:46 2023 +0300

    all: introduce confmigrate