refactor: pass experiment arguments using a struct (#983)

Closes https://github.com/ooni/probe/issues/2358.

internal/engine/experiment/telegram/telegram.go

@@ -101,8 +101,11 @@ func (m Measurer) ExperimentVersion() string {
 }
 
 // Run implements ExperimentMeasurer.Run
-func (m Measurer) Run(ctx context.Context, sess model.ExperimentSession,
-	measurement *model.Measurement, callbacks model.ExperimentCallbacks) error {
+func (m Measurer) Run(ctx context.Context, args *model.ExperimentArgs) error {
+	callbacks := args.Callbacks
+	measurement := args.Measurement
+	sess := args.Session
+
 	ctx, cancel := context.WithTimeout(ctx, 60*time.Second)
 	defer cancel()
 	urlgetter.RegisterExtensions(measurement)