Feat: opus metadata encoding (#12974)

Feat: Downloading: Add opus audio metadata tags for title, author, date, and a comment tag with the originating URL

This removes the DownloadManagerService.EXTRA_SOURCE field, which is always inferred from the StreamInfo.

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -1133,7 +1133,7 @@ public class DownloadDialog extends DialogFragment
         }
 
         DownloadManagerService.startMission(context, urls, storage, kind, threads,
-                currentInfo.getUrl(), psName, psArgs, nearLength, new ArrayList<>(recoveryInfo));
+                currentInfo, psName, psArgs, nearLength, new ArrayList<>(recoveryInfo));
 
         Toast.makeText(context, getString(R.string.download_has_started),
                 Toast.LENGTH_SHORT).show();