[YouTube] support extracting DRC audio

Implements support for checking whether an extracted audio format is using
dynamic range compression (DRC).

Author: FineFindus

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/ItagItem.java

@@ -266,6 +266,15 @@ public MediaFormat getMediaFormat() {
     private AudioTrackType audioTrackType;
     @Nullable
     private Locale audioLocale;
+    private boolean isDrc;
+
+    public Boolean isDrc() {
+        return isDrc;
+    }
+
+    public void setIsDrc(final Boolean isDrc) {
+        this.isDrc = isDrc;
+    }
 
     public int getBitrate() {
         return bitrate;

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -1421,6 +1421,7 @@ private ItagInfo buildAndAddItagInfoToList(
         itagItem.setIndexEnd(Integer.parseInt(indexRange.getString("end", "-1")));
         itagItem.setQuality(formatData.getString("quality"));
         itagItem.setCodec(codec);
+        itagItem.setIsDrc(formatData.getBoolean("isDrc", false));
 
         if (streamType == StreamType.LIVE_STREAM || streamType == StreamType.POST_LIVE_STREAM) {
             itagItem.setTargetDurationSec(formatData.getInt("targetDurationSec"));