chore(examples/basic): add startPosition sample (#3718)

* fix(ts): onPlaybackRateChangeData was not correctly typed

* fix: ensure tracks are well displayed in the sample

* fix: fix sample style & avoid changing channel onEnd when looping is enable

* chore: add startPosition in the sample

* chore: update startPosition for easier testing

examples/basic/src/VideoPlayer.tsx

@@ -133,6 +133,11 @@ class VideoPlayer extends Component {
       description: 'sintel with subtitles',
       uri: 'https://bitmovin-a.akamaihd.net/content/sintel/hls/playlist.m3u8',
     },
+    {
+      description: 'sintel starts at 20sec',
+      uri: 'https://bitmovin-a.akamaihd.net/content/sintel/hls/playlist.m3u8',
+      startPosition: 50000,
+    },
     {
       description: 'BigBugBunny sideLoaded subtitles',
       // sideloaded subtitles wont work for streaming like HLS on ios