Pull request: imp-json-resp

Merge in DNS/adguard-home from imp-json-resp to master

Squashed commit of the following:

commit 44532b6fa551815e5ea876e7320ce0a73c32b6fb
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Sep 30 15:59:58 2022 +0300

    all: imp json resp

internal/filtering/rewrites.go

@@ -240,13 +240,7 @@ func (d *DNSFilter) handleRewriteList(w http.ResponseWriter, r *http.Request) {
 	}
 	d.confLock.Unlock()
 
-	w.Header().Set("Content-Type", "application/json")
-	err := json.NewEncoder(w).Encode(arr)
-	if err != nil {
-		aghhttp.Error(r, w, http.StatusInternalServerError, "json.Encode: %s", err)
-
-		return
-	}
+	_ = aghhttp.WriteJSONResponse(w, r, arr)
 }
 
 func (d *DNSFilter) handleRewriteAdd(w http.ResponseWriter, r *http.Request) {