Support a module API surface for custom functionality (#8246)

* Early implementation of module API surface + functions for ILAG module

* Wire up dialog functions and ILAG-needed surface

* Ensure component renders for modules get overridden

* Respond to changes from module API interface

* Use a real module-api dependency

* Update for new Dialogs interface

* Add support for getConfigValue from module API

* Update the remainder of the module API interface

* Docs & cleanup

* Add some unit tests around module stuff

Needs end-to-end tests still.

* Appease early linters

* Break import cycles by not directly depending on Lifecycle

* Appease the linter

* Fix bad merge

src/dispatcher/actions.ts

@@ -316,6 +316,11 @@ export enum Action {
      */
     OnLoggedIn = "on_logged_in",
 
+    /**
+     * Overwrites the existing login with fresh session credentials. Use with a OverwriteLoginPayload.
+     */
+    OverwriteLogin = "overwrite_login",
+
     /**
      * Fired when the PlatformPeg gets a new platform set upon it, should only happen once per app load lifecycle.
      * Fires with the PlatformSetPayload.

src/dispatcher/payloads/OverwriteLoginPayload.ts

@@ -0,0 +1,25 @@
+/*
+Copyright 2022 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 { ActionPayload } from "../payloads";
+import { Action } from "../actions";
+import { IMatrixClientCreds } from "../../MatrixClientPeg";
+
+export interface OverwriteLoginPayload extends ActionPayload {
+    action: Action.OverwriteLogin;
+
+    credentials: IMatrixClientCreds;
+}