fix(android): remove remaining ad view when zapping (#3786)

* perf: ensure we do not provide callback to native if no callback provided from app

* chore: rework bufferConfig to make it more generic and reduce ReactExoplayerView code size

* chore: improve issue template

* fix(android): avoid video view flickering at playback startup

* fix(android): ensure adsLoader is well release if unused

android/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -712,6 +712,11 @@ private void initializePlayerSource(ReactExoplayerView self, DrmSessionManager d
                     .setLocalAdInsertionComponents(unusedAdTagUri -> adsLoader, exoPlayerView);
             DataSpec adTagDataSpec = new DataSpec(adTagUrl);
             mediaSourceWithAds = new AdsMediaSource(videoSource, adTagDataSpec, ImmutableList.of(srcUri, adTagUrl), mediaSourceFactory, adsLoader, exoPlayerView);
+        } else {
+            if (adTagUrl == null && adsLoader != null) {
+                adsLoader.release();
+                adsLoader = null;
+            }
         }
         MediaSource mediaSource;
         if (mediaSourceList.size() == 0) {