Log warning when using OAuth without supporting clients

Author: devoxin

common/src/main/java/dev/lavalink/youtube/YoutubeAudioSourceManager.java

@@ -31,6 +31,7 @@
 import java.io.DataOutput;
 import java.io.IOException;
 import java.net.URI;
+import java.util.Arrays;
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -169,6 +170,12 @@ public void setPlaylistPageCount(int count) {
      */
     public void useOauth2(@Nullable String refreshToken, boolean skipInitialization) {
         oauth2Handler.setRefreshToken(refreshToken, skipInitialization);
+
+        if (Arrays.stream(clients).noneMatch(Client::supportsOAuth)) {
+            log.warn("OAuth has been enabled without registering any OAuth-enabled clients. " +
+                "Please consult https://github.com/lavalink-devs/youtube-source?tab=readme-ov-file#available-clients for a list of " +
+                "OAuth-enabled clients.");
+        }
     }
 
     @Nullable