fix: Support Telegram Notification provider (#2225)

* fear: support telegram provider

* fix: fix telegram logo

* fix: fix telegram bot package

* Update telegram.go

* Update notification.go

---------

Co-authored-by: hsluoyz <hsluoyz@qq.com>

web/src/common/TestNotificationWidget.js

@@ -0,0 +1,42 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import * as Setting from "../Setting";
+import i18next from "i18next";
+
+export function sendTestNotification(provider, notification) {
+  testNotificationProvider(provider, notification)
+    .then((res) => {
+      if (res.status === "ok") {
+        Setting.showMessage("success", `${i18next.t("provider:Notification sent successfully")}`);
+      } else {
+        Setting.showMessage("error", res.msg);
+      }
+    })
+    .catch(error => {
+      Setting.showMessage("error", `${i18next.t("general:Failed to connect to server")}: ${error}`);
+    });
+}
+
+function testNotificationProvider(provider, email = "") {
+  const notificationForm = {
+    content: provider.content,
+  };
+
+  return fetch(`${Setting.ServerUrl}/api/send-notification?provider=` + provider.name, {
+    method: "POST",
+    credentials: "include",
+    body: JSON.stringify(notificationForm),
+  }).then(res => res.json());
+}