Pull request: 182-cmd-args

Squashed commit of the following:

commit 82901d7
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Wed Sep 11 17:16:25 2024 +0700

    cmd: imp code

commit 9d330d4
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Wed Sep 11 10:22:59 2024 +0700

    cmd: imp code

commit ef58ba6
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Sep 10 10:40:41 2024 +0700

    cmd: imp code

commit 2c6f533
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 13:29:59 2024 +0700

    cmd: imp code

commit d4bc235
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 13:08:01 2024 +0700

    cmd: imp code

commit ccb5798
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 12:23:42 2024 +0700

    cmd: imp docs

commit c50fa6e
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 12:05:23 2024 +0700

    cmd: imp code

commit 46bd9e5
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 11:52:12 2024 +0700

    cmd: imp code

commit 0f0df34
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 11:44:55 2024 +0700

    cmd: imp code

commit 21c7d22
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 11:11:46 2024 +0700

    cmd: imp code

commit 8978f06
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Mon Sep 9 11:00:38 2024 +0700

    cmd: imp code

commit f8a4e2a
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Thu Sep 5 11:54:56 2024 +0800

    cmd: imp code

commit b86c63e
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Tue Sep 3 09:53:40 2024 +0300

    cmd: flag slice structs

commit 2f59748
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Aug 30 16:56:04 2024 +0300

    cmd: imp code

commit 4b09664
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Aug 30 16:45:43 2024 +0300

    cmd: imp code

commit 87aa2f5
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Fri Aug 30 09:18:24 2024 +0300

    cmd: imp code

commit 29736a1
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Thu Aug 29 16:47:40 2024 +0300

    cmd: imp code

commit 8d125a4
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Thu Aug 29 11:24:10 2024 +0300

    cmd: imp code

commit 7c8b869
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Thu Aug 29 09:51:32 2024 +0300

    cmd: help

commit 123a85d
Author: Dimitry Kolyshev <dkolyshev@adguard.com>
Date:   Thu Aug 29 09:25:18 2024 +0300

    cmd: opts merge

... and 8 more commits

go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/ameshkov/dnsstamps v1.0.3
 	github.com/beefsack/go-rate v0.0.0-20220214233405-116f4ca011a0
 	github.com/bluele/gcache v0.0.2
-	github.com/jessevdk/go-flags v1.6.1
 	github.com/miekg/dns v1.1.58
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/quic-go/quic-go v0.44.0

go.sum

@@ -26,8 +26,6 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20240130152714-0ed6a68c8d9e h1:E+3PBMCXn0ma79O7iCrne0iUpKtZ7rIcZvoz+jNtNtw=
 github.com/google/pprof v0.0.0-20240130152714-0ed6a68c8d9e/go.mod h1:czg5+yv1E0ZGTi6S6vVK1mke0fV+FaUhNGcd6VRS9Ik=
-github.com/jessevdk/go-flags v1.6.1 h1:Cvu5U8UGrLay1rZfv/zP7iLpSHGUZ/Ou68T0iX1bBK4=
-github.com/jessevdk/go-flags v1.6.1/go.mod h1:Mk8T1hIAWpOiJiHa9rJASDK2UGWji0EuPGBnNLMooyc=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=