feat: add playback monitoring

Resolves #262, by allowing to track media playback sessions. With to the data
sent, it will be possible to have a better overview of the quality of our
service. Finally, it will help us to investigate potential causes of playback
problems, so that we can better help our users or provide them with a more
accurate response.

- rename `analytics` folder to `trackers`
- add `PillarboxMonitoring` class
- modify `srgssr` middleware to add support for new tracker
- add unit test
- extract `srg-analytics` player mock to make it reusable
- rename `test/analytics` folder to `test/trackers`

src/middleware/srgssr.js

@@ -3,7 +3,8 @@ import DataProvider from '../dataProvider/services/DataProvider.js';
 import Image from '../utils/Image.js';
 import Drm from '../utils/Drm.js';
 import AkamaiTokenService from '../utils/AkamaiTokenService.js';
-import SRGAnalytics from '../analytics/SRGAnalytics.js';
+import SRGAnalytics from '../trackers/SRGAnalytics.js';
+import PillarboxMonitoring from '../trackers/PillarboxMonitoring.js';
 import MediaComposition from '../dataProvider/model/MediaComposition.js';
 
 // Translations
@@ -473,6 +474,8 @@ class SrgSsr {
    * @returns {Promise<import('./typedef').ComposedSrcMediaData>} - The composed source media data.
    */
   static async getSrcMediaObj(player, srcObj) {
+    player.trigger('pillarbox-monitoring/sessionstart');
+
     const { src: urn, ...srcOptions } = srcObj;
     const mediaComposition = await SrgSsr.getMediaComposition(
       urn,
@@ -599,6 +602,33 @@ class SrgSsr {
     }
   }
 
+  /**
+   * SRG monitoring singleton.
+   *
+   * @param {import('video.js/dist/types/player').default} player
+   *
+   * @returns {PillarboxMonitoring} instance of PillarboxMonitoring
+   */
+  static srgMonitoring(player) {
+    if (player.options().trackers.srgMonitoring === false) return;
+
+    if (!player.options().trackers.srgMonitoring) {
+      const srgMonitoring = new PillarboxMonitoring(player, {
+        debug: player.debug(),
+        playerVersion: Pillarbox.VERSION.pillarbox,
+        playerName: 'Pillarbox',
+      });
+
+      player.options({
+        trackers: {
+          srgMonitoring,
+        },
+      });
+    }
+
+    return player.options().trackers.srgMonitoring;
+  }
+
   /**
    * Update player's poster.
    *
@@ -637,7 +667,7 @@ class SrgSsr {
    * @returns {Object}
    */
   static middleware(player) {
-
+    SrgSsr.srgMonitoring(player);
     SrgSsr.cuechangeEventProxy(player);
 
     return {