refactor: fully move IDNAResolver to netxlite (#433)

We started doing this in https://github.com/ooni/probe-cli/pull/432.

This work is part of https://github.com/ooni/probe/issues/1733.

internal/engine/experiment/websteps/dns.go

@@ -21,7 +21,7 @@ func DNSDo(ctx context.Context, config DNSConfig) ([]string, error) {
 		childResolver, err := netx.NewDNSClient(netx.Config{Logger: log.Log}, "doh://google")
 		runtimex.PanicOnError(err, "NewDNSClient failed")
 		var resolver netxlite.Resolver = childResolver
-		resolver = &netxlite.IDNAResolver{Resolver: resolver}
+		resolver = &netxlite.ResolverIDNA{Resolver: resolver}
 	}
 	return config.Resolver.LookupHost(ctx, config.Domain)
 }