refactor(mlablocate*): move from i/e/internal to internal (#385)

We've been flattening the package structure for some time now.

While there, add very basic examples.

internal/engine/experiment/dash/locate.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"net/http"
 
-	"github.com/ooni/probe-cli/v3/internal/engine/internal/mlablocate"
 	"github.com/ooni/probe-cli/v3/internal/engine/model"
+	"github.com/ooni/probe-cli/v3/internal/mlablocate"
 )
 
 type locateDeps interface {

internal/engine/experiment/ndt7/ndt7.go

@@ -11,10 +11,10 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/ooni/probe-cli/v3/internal/engine/internal/mlablocatev2"
 	"github.com/ooni/probe-cli/v3/internal/engine/model"
 	"github.com/ooni/probe-cli/v3/internal/engine/netx"
 	"github.com/ooni/probe-cli/v3/internal/humanize"
+	"github.com/ooni/probe-cli/v3/internal/mlablocatev2"
 )
 
 const (

internal/mlablocate/example_test.go

@@ -0,0 +1,19 @@
+package mlablocate_test
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/apex/log"
+	"github.com/ooni/probe-cli/v3/internal/mlablocate"
+)
+
+func Example_usage() {
+	clnt := mlablocate.NewClient(http.DefaultClient, log.Log, "miniooni/0.1.0-dev")
+	result, err := clnt.Query(context.Background(), "neubot/dash")
+	if err != nil {
+		log.WithError(err).Fatal("clnt.Query failed")
+	}
+	fmt.Printf("%s\n", result.FQDN)
+}

internal/mlablocatev2/example_test.go

@@ -0,0 +1,19 @@
+package mlablocatev2_test
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/apex/log"
+	"github.com/ooni/probe-cli/v3/internal/mlablocatev2"
+)
+
+func Example_usage() {
+	clnt := mlablocatev2.NewClient(http.DefaultClient, log.Log, "miniooni/0.1.0-dev")
+	results, err := clnt.QueryNDT7(context.Background())
+	if err != nil {
+		log.WithError(err).Fatal("clnt.QueryNDT7 failed")
+	}
+	fmt.Printf("%+v\n", results)
+}