[YouTube] Support playlists as URL navigation endpoints

Author: AudricV

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

@@ -825,9 +825,15 @@ public static String getUrlFromNavigationEndpoint(
             final String canonicalBaseUrl = browseEndpoint.getString("canonicalBaseUrl");
             final String browseId = browseEndpoint.getString("browseId");
 
-            // All channel ids are prefixed with UC
-            if (browseId != null && browseId.startsWith("UC")) {
-                return "https://www.youtube.com/channel/" + browseId;
+            if (browseId != null) {
+                if (browseId.startsWith("UC")) {
+                    // All channel IDs are prefixed with UC
+                    return "https://www.youtube.com/channel/" + browseId;
+                } else if (browseId.startsWith("VL")) {
+                    // All playlist IDs are prefixed with VL, which needs to be removed from the
+                    // playlist ID
+                    return "https://www.youtube.com/playlist?list=" + browseId.substring(2);
+                }
             }
 
             if (!isNullOrEmpty(canonicalBaseUrl)) {