inlet/snmp: use netip.Addr internally instead of string

Also, make SubnetMap use `netip.Addr` as well.

common/helpers/tests.go

@@ -16,6 +16,7 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"net/netip"
 	"os"
 	"reflect"
 	"testing"
@@ -34,6 +35,7 @@ var prettyC = pretty.Config{
 	IncludeUnexported: false,
 	Formatter: map[reflect.Type]interface{}{
 		reflect.TypeOf(net.IP{}):            fmt.Sprint,
+		reflect.TypeOf(netip.Addr{}):        fmt.Sprint,
 		reflect.TypeOf(time.Time{}):         fmt.Sprint,
 		reflect.TypeOf(SubnetMap[string]{}): fmt.Sprint,
 	},