VEX-6030: Further prevent memory crashes (24i#15)

This PR is intended to prevent memory crashes when the free memory runs out

Jira: VEX-6030
https://jira.tenkasu.net/browse/VEX-6030

Velocity PR: crunchyroll/velocity#2043

By forcefully calling the garbage collector the memory crashes, specially on lower resolutions (<720p) are gone on devices with 2GB of ram or less and Android 6, also testing 3GB Android 7 with this patch, so far is working as intended

Reviews
Major reviewer (domain expert): @nickfujita
Minor reviewer: @jctorresM

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

@@ -423,6 +423,7 @@ private void reLayout(View view) {
 
     private class RNVLoadControl extends DefaultLoadControl {
         private int availableHeapInBytes = 0;
+        private Runtime runtime;
         public RNVLoadControl(DefaultAllocator allocator, int minBufferMs, int maxBufferMs, int bufferForPlaybackMs, int bufferForPlaybackAfterRebufferMs, int targetBufferBytes, boolean prioritizeTimeOverSizeThresholds, int backBufferDurationMs, boolean retainBackBufferFromKeyframe) {
             super(allocator,
                     minBufferMs,
@@ -433,6 +434,7 @@ public RNVLoadControl(DefaultAllocator allocator, int minBufferMs, int maxBuffer
                     prioritizeTimeOverSizeThresholds,
                     backBufferDurationMs,
                     retainBackBufferFromKeyframe);
+            runtime = Runtime.getRuntime();
             ActivityManager activityManager = (ActivityManager) themedReactContext.getSystemService(themedReactContext.ACTIVITY_SERVICE);
             availableHeapInBytes = (int) Math.floor(activityManager.getMemoryClass() * maxHeapAllocationPercent * 1024 * 1024);
         }
@@ -447,6 +449,11 @@ public boolean shouldContinueLoading(long playbackPositionUs, long bufferedDurat
             if (isHeapReached) {
                 return false;
             }
+            if (runtime.freeMemory() == 0) {
+                Log.w("ExoPlayer Warning", "Free memory reached 0, forcing garbage collection");
+                runtime.gc();
+                return false;
+            }
             return super.shouldContinueLoading(playbackPositionUs, bufferedDurationUs, playbackSpeed);
         }
     }