Add analytics to activity toggles (#12418)

* Add analytics to activity toggles

Requires https://github.com/matrix-org/matrix-analytics-events/pull/101

* Add test

* Fix comment a bit

* Update to new analytics events package

src/settings/controllers/AnalyticsController.ts

@@ -0,0 +1,42 @@
+/*
+Copyright 2024 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 SettingController from "./SettingController";
+import { SettingLevel } from "../SettingLevel";
+import PosthogTrackers, { InteractionName } from "../../PosthogTrackers";
+
+/**
+ * Controller that sends events to analytics when a setting is changed.
+ * Since it will only trigger events when the setting is changed,
+ * (and the value isn't reported: only the fact that it's been toggled)
+ * it won't be useful for tracking what percentage of a userbase has a given setting
+ * enabled, but many of our settings can be set per device and Posthog only supports
+ * per-user properties, so this isn't straightforward. This is only for seeing how
+ * often people interact with the settings.
+ */
+export default class AnalyticsController extends SettingController {
+    /**
+     *
+     * @param interactionName The name of the event to send to analytics
+     */
+    public constructor(private interactionName: InteractionName) {
+        super();
+    }
+
+    public onChange(_level: SettingLevel, _roomId: string | null, _newValue: any): void {
+        PosthogTrackers.trackInteraction(this.interactionName);
+    }
+}