add scoresaber feed command and websocket impl

src/main/java/cc/fascinated/bat/common/NumberUtils.java

@@ -19,6 +19,7 @@ public class NumberUtils {
     public static String formatNumberCommas(double number) {
         NumberFormat format = NumberFormat.getNumberInstance();
         format.setGroupingUsed(true);
+        format.setMaximumFractionDigits(2);
         return format.format(number);
     }
 }