cherry-pick: all: add us to logs

Merge in DNS/adguard-home from imp-logs to master

Squashed commit of the following:

commit b463825196625f59b19977920f828f57e4b87f0d
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue May 18 14:08:24 2021 +0300

    all: add us to logs

CHANGELOG.md

@@ -23,6 +23,10 @@ and this project adheres to
   script ([#2462]).
 - Support for DHCP `DECLINE` and `RELEASE` message types ([#3053]).
 
+### Changed
+
+- Add microseconds to log output.
+
 ### Fixed
 
 - Intermittent "Warning: ID mismatch" errors ([#3087]).