Added configurable Connection Throttle. Addresses BUKKIT-1274

By: EvilSeph <evilseph@gmail.com>

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -310,6 +310,10 @@ public final class Bukkit {
         return server.getUpdateFolderFile();
     }
 
+    public static long getConnectionThrottle() {
+        return server.getConnectionThrottle();
+    }
+
     public static int getTicksPerAnimalSpawns() {
         return server.getTicksPerAnimalSpawns();
     }