Add Flashduty notification (#3475)

* feat: add FlashDuty notification channel

* refactor: #3475 nofify with Up or Down;
refactor code;
add en zh-hk zh-tw lang

* refactor: default select Info

* refactor: add space in word

* refactor the flashduty notification code

* refactor:compatible when Test flashduty nofication

* refactor: add function param description

* refactor: revert zh-hk zh-tw changes of flashduty

src/lang/zh-CN.json

@@ -413,6 +413,7 @@
     "smtpDkimheaderFieldNames": "包含在哈希计算对象内的 Header 列表（可选）",
     "smtpDkimskipFields": "不包含在哈希计算对象内的 Header 列表（可选）",
     "wayToGetPagerDutyKey": "您可以在 Service -> Service Directory -> (选择一个 Service) -> Integrations -> Add integration 页面中搜索“Events API V2”以获取此 Integration Key，更多信息请看{0}",
+    "wayToGetFlashDutyKey": "您可以进入 协作空间 -> (选择一个 协作空间) -> 集成数据 -> 新增一个集成 页面，添加“自定义事件”获得一个推送地址，复制地址中的 Integration Key，更多信息前往{0}",
     "Integration Key": "集成密钥",
     "Integration URL": "集成网址",
     "Auto resolve or acknowledged": "自动标记为已解决或已读",
@@ -784,5 +785,6 @@
     "Edit Maintenance": "编辑维护计划",
     "Home": "首页",
     "noGroupMonitorMsg": "暂无可用，请先创建一个监控项组。",
-    "Close": "关闭"
+    "Close": "关闭",
+    "FlashDuty Severity":"严重程度"
 }