Pull request: 5035-netip-arp-hosts

Updates #5035.

Squashed commit of the following:

commit d1c4493ee4e28d05670c20532ebae1aa809d18da
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Oct 25 14:26:52 2022 +0300

    aghnet: imp hosts rec equal

commit 0a7f40a64a819245fba20d3b481b0fc34e0c60e6
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Oct 24 18:10:09 2022 +0300

    aghnet: move arp and hosts to netip.Addr

internal/aghnet/arpdb_windows.go

@@ -5,6 +5,7 @@ package aghnet
 import (
 	"bufio"
 	"net"
+	"net/netip"
 	"strings"
 	"sync"
 )
@@ -43,13 +44,15 @@ func parseArpA(sc *bufio.Scanner, lenHint int) (ns []Neighbor) {
 
 		n := Neighbor{}
 
-		if ip := net.ParseIP(fields[0]); ip == nil {
+		ip, err := netip.ParseAddr(fields[0])
+		if err != nil {
 			continue
 		} else {
 			n.IP = ip
 		}
 
-		if mac, err := net.ParseMAC(fields[1]); err != nil {
+		mac, err := net.ParseMAC(fields[1])
+		if err != nil {
 			continue
 		} else {
 			n.MAC = mac