Pull request: scripts: imp linter scripts

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

Squashed commit of the following:

commit f5b5115a225431855798764770423209e03d6020
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Aug 23 17:57:59 2021 +0300

    scripts: imp linter scripts

internal/tools/tools.go

@@ -4,6 +4,7 @@
 package tools
 
 import (
+	// Tools.
 	_ "github.com/fzipp/gocyclo/cmd/gocyclo"
 	_ "github.com/golangci/misspell/cmd/misspell"
 	_ "github.com/gordonklaus/ineffassign"