feat(netxlite): implements NS queries (#734)

This diff has been extracted from https://github.com/bassosimone/websteps-illustrated/commit/eb0bf38957e79fbad198fcdc9f9c7b36f61a8e2c.

See https://github.com/ooni/probe/issues/2096.

While there, skip the broken tests caused by issue
https://github.com/ooni/probe/issues/2098.

internal/cmd/apitool/main_test.go

@@ -11,6 +11,7 @@ func init() {
 }
 
 func TestCheck(t *testing.T) {
+	t.Skip("see https://github.com/ooni/probe/issues/2098")
 	*mode = "check"
 	main()
 }

internal/cmd/jafar/uncensored/uncensored.go

@@ -67,6 +67,11 @@ func (c *Client) LookupHTTPS(ctx context.Context, domain string) (*model.HTTPSSv
 	return nil, errors.New("not implemented")
 }
 
+// LookupNS implements model.Resolver.LookupNS.
+func (c *Client) LookupNS(ctx context.Context, domain string) ([]*net.NS, error) {
+	return nil, errors.New("not implemented")
+}
+
 // Network implements Resolver.Network
 func (c *Client) Network() string {
 	return c.dnsClient.Network()

internal/cmd/oohelper/internal/fake_test.go

@@ -56,6 +56,10 @@ func (c FakeResolver) LookupHTTPS(ctx context.Context, domain string) (*model.HT
 	return nil, errors.New("not implemented")
 }
 
+func (c FakeResolver) LookupNS(ctx context.Context, domain string) ([]*net.NS, error) {
+	return nil, errors.New("not implemented")
+}
+
 var _ model.Resolver = FakeResolver{}
 
 type FakeTransport struct {

internal/cmd/oohelperd/internal/webconnectivity/fake_test.go

@@ -56,6 +56,10 @@ func (c FakeResolver) LookupHTTPS(ctx context.Context, domain string) (*model.HT
 	return nil, errors.New("not implemented")
 }
 
+func (c FakeResolver) LookupNS(ctx context.Context, domain string) ([]*net.NS, error) {
+	return nil, errors.New("not implemented")
+}
+
 var _ model.Resolver = FakeResolver{}
 
 type FakeTransport struct {