title: ionic 4 - how to retrieve data passed to a modal
body: <p>According to the Ionic 4 docs, you can pass data via the componentProps property.
  In Ionic3 I can retrieve it with the navParams Service. How do I do it in Ionic 4?</p>
  
  <pre><code>async presentModal() {
      const modal = await this.modalController.create({
        component: ModalPage,
        componentProps: { value: 123 }
      });
      return await modal.present();
    }
  </code></pre>