Add Voice and Video call in room header (#11444)

* Add Voice and Video call in room header

* Add thread icon in room header

* Add room notification icon to room header

* Fix linting

* Add tests for buttons in room header

* Add JSDoc

* micro optimisations

* Fix call disabled when hanging up

* Fix disabled state change on members count update

* Exclude functional members from members count optionally

* i18n

src/hooks/useGlobalNotificationState.ts

@@ -0,0 +1,44 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+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 { useState } from "react";
+
+import { SummarizedNotificationState } from "../stores/notifications/SummarizedNotificationState";
+import {
+    RoomNotificationStateStore,
+    UPDATE_STATUS_INDICATOR,
+} from "../stores/notifications/RoomNotificationStateStore";
+import { useEventEmitter } from "./useEventEmitter";
+
+/**
+ * Tracks the global notification state of the user's account
+ * @returns A global notification state object
+ */
+export const useGlobalNotificationState = (): SummarizedNotificationState => {
+    const [summarizedNotificationState, setSummarizedNotificationState] = useState(
+        RoomNotificationStateStore.instance.globalState,
+    );
+
+    useEventEmitter(
+        RoomNotificationStateStore.instance,
+        UPDATE_STATUS_INDICATOR,
+        (notificationState: SummarizedNotificationState) => {
+            setSummarizedNotificationState(notificationState);
+        },
+    );
+
+    return summarizedNotificationState;
+};