Add labs flag to automatically rageshake on decryption errors (#7307)

Also sends a to-device message to the sender, prompting them to auto-rageshake too if they have this lab enabled as well.

Co-authored-by: Šimon Brandner <simon.bra.ag@gmail.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/MatrixChat.tsx

@@ -44,6 +44,7 @@ import * as Rooms from '../../Rooms';
 import * as Lifecycle from '../../Lifecycle';
 // LifecycleStore is not used but does listen to and dispatch actions
 import '../../stores/LifecycleStore';
+import '../../stores/AutoRageshakeStore';
 import PageType from '../../PageTypes';
 import createRoom, { IOpts } from "../../createRoom";
 import { _t, _td, getCurrentLanguage } from '../../languageHandler';

src/components/views/settings/tabs/user/LabsUserSettingsTab.tsx

@@ -129,6 +129,11 @@ export default class LabsUserSettingsTab extends React.Component<{}, IState> {
                     name="automaticErrorReporting"
                     level={SettingLevel.DEVICE}
                 />,
+                <SettingsFlag
+                    key="automaticDecryptionErrorReporting"
+                    name="automaticDecryptionErrorReporting"
+                    level={SettingLevel.DEVICE}
+                />,
             );
 
             if (this.state.showHiddenReadReceipts) {