feat: 🎸 Expose extension config to modules (#1279)

* feat: 🎸 Expose extension config to modules

Currently, only the preRegistration hook receives the extension's
configuration as a parameter. Providing getModuleFn's with the
extension's configuration, and all lifecycle/modules with the
application's configuration as rootConfig should open the doors to more
configurable extensions.

Closes: #1268

* CR Update: Pass extension and service config through extension manager preinit/getmodule

* CR Update: Remove appConfig from servicesManager

* CR Update: Remove appconfig variable

extensions/_example/src/index.js

@@ -14,6 +14,7 @@ export default {
   preRegistration({
     servicesManager = {},
     commandsManager = {},
+    appConfig = {},
     configuration = {},
   }) {},