Refactor: Rename AuthModule to SessionModule and update client getter

This commit renames `AuthModule` to `SessionModule` to better reflect its purpose.

Additionally, the method `authenticatedFeeds` within the module has been renamed to `authenticatedFeedsClient` for clarity. This change has been propagated to the dependency injection configuration.

Author: xsahil03x

sample_app/lib/core/di/di_initializer.config.dart

@@ -6,7 +6,7 @@ import '../../app/content/auth_controller.dart';
 @module
 abstract class SessionModule {
   @Singleton(scope: 'session')
-  StreamFeedsClient authenticatedFeeds(AuthController auth) {
+  StreamFeedsClient authenticatedFeedsClient(AuthController auth) {
     return (auth.value as Authenticated).client;
   }
 }