Merge in DNS/dnsproxy from 5251-close-ups to master

Updates AdguardTeam/AdGuardHome#5251.

Squashed commit of the following:

commit c4f01d3ff8f4dd3733124a6545ac3e6aa2e2f457
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Dec 14 17:57:19 2022 +0300

    upstream: enhance filtered errs

commit ce33519d844e2979d554d1001be1680f6299df08
Merge: 175680b8 0ce51f57
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Dec 14 13:29:27 2022 +0300

    Merge branch 'master' into 5251-close-ups

commit 175680b8
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 13 15:06:01 2022 +0300

    upstream: fix doc

commit 9ecfc0b2
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 13 14:59:04 2022 +0300

    all: imp docs

commit b275d566
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Dec 13 02:11:13 2022 +0300

    upstream: imp dot

commit 0ed84f4c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 20:40:35 2022 +0300

    fastip: fix golangci-lint issues

commit c5ed13b2
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 20:15:45 2022 +0300

    all: fix staticcheck issues

commit 6c8b28cc
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 20:05:24 2022 +0300

    upstream: imp more

commit e4a2374d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 19:01:57 2022 +0300

    upstream: upd golibs, imp code

commit cae16109
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 16:27:21 2022 +0300

    upstream: filter dot errs

commit 51005abc
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Mon Dec 12 14:10:23 2022 +0300

    upstream: use sync pool

commit 81e907c5
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Sat Dec 10 03:37:21 2022 +0300

    upstream: imp dot