RoomListViewModel: Add functionality to toggle message preview setting (#29511)

* Add setting for showing message previews

* Add hook to track and toggle message preview

* Use hook in view model

* Add tests

* Fix tests

* Fix lint

* Fix typo

src/settings/Settings.tsx

@@ -314,6 +314,7 @@ export interface Settings {
     "showImages": IBaseSetting<boolean>;
     "showAvatarsOnInvites": IBaseSetting<boolean>;
     "RoomList.preferredSorting": IBaseSetting<SortingAlgorithm>;
+    "RoomList.showMessagePreview": IBaseSetting<boolean>;
     "RightPanel.phasesGlobal": IBaseSetting<IRightPanelForRoomStored | null>;
     "RightPanel.phases": IBaseSetting<IRightPanelForRoomStored | null>;
     "enableEventIndexing": IBaseSetting<boolean>;
@@ -1126,6 +1127,10 @@ export const SETTINGS: Settings = {
         supportedLevels: [SettingLevel.DEVICE],
         default: SortingAlgorithm.Recency,
     },
+    "RoomList.showMessagePreview": {
+        supportedLevels: [SettingLevel.DEVICE],
+        default: false,
+    },
     "RightPanel.phasesGlobal": {
         supportedLevels: [SettingLevel.DEVICE],
         default: null,