Pull request: Migrate to netip.Addr vol.1

Merge in DNS/adguard-home from 2926-lla-v6 to master

Updates #2926.
Updates #5035.

Squashed commit of the following:

commit 2e770d4b6d4e1ec3f7762f2f2466662983bf146c
Merge: 25c1afc5 893358ea
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Oct 14 15:14:56 2022 +0300

    Merge branch 'master' into 2926-lla-v6

commit 25c1afc5f0a5027fafac9dee77618886aefee29c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Oct 13 18:24:20 2022 +0300

    all: imp code, docs

commit 59549c4f74ee17b10eae542d1f1828d4e59894c9
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Oct 11 18:49:09 2022 +0300

    dhcpd: use netip initially

commit 1af623096b0517d07752385540f2f750f7f5b3bb
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Sep 30 18:03:52 2022 +0300

    all: imp docs, code

commit e9faeb71dbc0e887b25a7f3d5b33a401805f2ae7
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 29 14:56:37 2022 +0300

    all: use netip for web

commit 38305e555a6884c3bd1b0839330b942ce0e59093
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Sep 28 19:13:58 2022 +0300

    add basic lla

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to
 
 ## Added
 
+- The ability to serve DNS on link-local IPv6 addresses ([#2926]).
 - The ability to put [ClientIDs][clientid] into DNS-over-HTTPS hostnames as
   opposed to URL paths ([#3418]).  Note that AdGuard Home checks the server name
   only if the URL does not contain a ClientID.
@@ -33,6 +34,7 @@ and this project adheres to
   cached now ([#4942]).
 - Web UI not switching to HTTP/3 ([#4986], [#4993]).
 
+[#2926]: https://github.com/AdguardTeam/AdGuardHome/issues/2926
 [#3418]: https://github.com/AdguardTeam/AdGuardHome/issues/3418
 [#4942]: https://github.com/AdguardTeam/AdGuardHome/issues/4942
 [#4986]: https://github.com/AdguardTeam/AdGuardHome/issues/4986