Add warning on Bungee startup

Without more specific injection points as with Velocity, Via has started failing more and more on Bungee and maintaining the required hackfixes coming from that has shown time intensive

bungee/src/main/java/com/viaversion/viaversion/BungeePlugin.java

@@ -68,6 +68,9 @@ public class BungeePlugin extends Plugin implements ViaServerProxyPlatform<Proxi
             getLogger().warning("/_____________\\");
         }
 
+        getLogger().warning("ViaVersion does not work as intended across many different server versions, especially the more recent ones. " +
+            "Consider moving Via plugins to your backend server or switching to Velocity.");
+
         api = new BungeeViaAPI();
         config = new BungeeViaConfig(getDataFolder());
         BungeeCommandHandler commandHandler = new BungeeCommandHandler();