Initial implementation of AccountSettings. (#6275)

* Make the UserPreference macro also generate an accessor for the key name.

* Initial implementation of AccountSettings.

- Add an AccountUserDefaults storage with a userID prefix on the key.
- Migrate the 2 values reset by AppSettings.resetSessionSpecificSettings to AccountSettings.

* Rename UserSettings.volatile() to UserSettings.mock()

Given it now has a userID parameter with a default value..

ElementX/Sources/Screens/RoomScreen/ComposerToolbar/ComposerToolbarViewModel.swift

@@ -852,7 +852,7 @@ extension ComposerToolbarViewModel {
                                                  completionSuggestionService: CompletionSuggestionServiceMock(configuration: .init(suggestions: suggestions)),
                                                  mediaProvider: MediaProviderMock(.init()),
                                                  mentionDisplayHelper: ComposerMentionDisplayHelper.mock,
-                                                 userSettings: .volatile(),
+                                                 userSettings: .mock(),
                                                  analyticsService: AnalyticsServiceMock(.init()),
                                                  composerDraftService: ComposerDraftServiceMock(.init()))
         viewModel.state.bindings.composerFocused = focused

ElementX/Sources/Screens/RoomScreen/ComposerToolbar/View/RoomAttachmentPicker.swift

@@ -81,7 +81,7 @@ struct RoomAttachmentPicker_Previews: PreviewProvider, TestablePreview {
     static let viewModel = makeViewModel()
     
     static func makeViewModel() -> ComposerToolbarViewModel {
-        let userSettings = UserSettings.volatile()
+        let userSettings = UserSettings.mock()
         
         return ComposerToolbarViewModel(roomProxy: JoinedRoomProxyMock(.init()),
                                         wysiwygViewModel: WysiwygComposerViewModel(),

ElementX/Sources/Screens/RoomScreen/View/RoomScreen.swift

@@ -395,7 +395,7 @@ struct RoomScreen_Previews: PreviewProvider, TestablePreview {
                                                       powerLevelsConfiguration: .init(canUserSendMessage: canSendMessage)))
         let roomViewModel = RoomScreenViewModel.mock(roomProxyMock: roomProxyMock)
         
-        let userSettings = UserSettings.volatile()
+        let userSettings = UserSettings.mock()
         userSettings.messageMultiSelectEnabled = isSelecting
         let userSession = UserSessionMock(.init(userSettings: userSettings))