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.