Pull request: 4238 response filtering

Merge in DNS/adguard-home from 4238-response-filtering to master

Closes #4238.

Squashed commit of the following:

commit 2113f83c617a396a39f910bb8df939364fedf391
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 3 21:04:25 2022 +0300

    dnsforward: restore a bit

commit f78607ed97892557c6bd6f3c3332f0bae01c1987
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 3 20:52:45 2022 +0300

    all: imp code, docs

commit 646074ce141e8ac12a972f46d071389a2ce124e4
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 3 20:37:05 2022 +0300

    all: log changes

commit 94556d810549370fc455bcf14537fa1d2783eed1
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Feb 3 20:30:57 2022 +0300

    all: imp test upstream, cover resp filtering

commit 63e7721822a049734a390c7d7ea6d8416a43c8b5
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Feb 1 21:58:08 2022 +0300

    all: filter response by rrtype

CHANGELOG.md

@@ -21,6 +21,8 @@ and this project adheres to
 
 ### Changed
 
+- Response filtering is now performed using the record types of the answer
+  section of messages as opposed to the type of the question ([#4238]).
 - Instead of adding the build time information, the build scripts now use the
   standardized environment variable [`SOURCE_DATE_EPOCH`][repr] to add the date
   of the commit from which the binary was built ([#4221]).  This should simplify
@@ -80,6 +82,7 @@ In this release, the schema version has changed from 12 to 13.
 [#3057]: https://github.com/AdguardTeam/AdGuardHome/issues/3057
 [#3367]: https://github.com/AdguardTeam/AdGuardHome/issues/3367
 [#4221]: https://github.com/AdguardTeam/AdGuardHome/issues/4221
+[#4238]: https://github.com/AdguardTeam/AdGuardHome/issues/4238
 
 [repr]: https://reproducible-builds.org/docs/source-date-epoch/