feat: support shutdown log by OFF level

powerjob-common/src/main/java/tech/powerjob/common/enums/LogLevel.java

@@ -18,7 +18,8 @@ public enum LogLevel {
     DEBUG(1),
     INFO(2),
     WARN(3),
-    ERROR(4);
+    ERROR(4),
+    OFF(99);
 
     private final int v;