Merge in DNS/dnsproxy from pprof to master

Squashed commit of the following:

commit cd92926cc1f18c06213672d81ea41d96b96770db
Author: Andrey Meshkov <am@adguard.com>
Date:   Tue Nov 8 12:00:54 2022 +0300

    fix review comments

commit 0d85fb9a
Author: Andrey Meshkov <am@adguard.com>
Date:   Sun Nov 6 18:19:25 2022 +0300

    Added an option to expose pprof info

    Users can now specify the --prof flag to make dnsproxy expose
    pprof info to localhost:6060.

    Updates #285