Pull request: upd-go

Merge in DNS/adguard-home from upd-go to master

Squashed commit of the following:

commit 8edfb5cc3466c1e4ee2eacae5157bd93c135a284
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Aug 3 14:25:45 2022 +0300

    all: imp docs; fmt

commit 080b8a85c02afbdaa079c0da47cb7b6311d50fbe
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Aug 2 20:51:20 2022 +0300

    all: upd go, imp generic code

internal/aghhttp/aghhttp.go

@@ -17,7 +17,7 @@ func OK(w http.ResponseWriter) {
 }
 
 // Error writes formatted message to w and also logs it.
-func Error(r *http.Request, w http.ResponseWriter, code int, format string, args ...interface{}) {
+func Error(r *http.Request, w http.ResponseWriter, code int, format string, args ...any) {
 	text := fmt.Sprintf(format, args...)
 	log.Error("%s %s: %s", r.Method, r.URL, text)
 	http.Error(w, text, code)