feat(SharedDataBloc): add country and language repositories and trigger data request

- Inject countriesRepository and languagesRepository into SharedDataBloc
- Dispatch SharedDataRequested event after bloc initialization
- Update dependencies in App widget

Author: fulleni

lib/app/view/app.dart

@@ -108,7 +108,9 @@ class App extends StatelessWidget {
               headlinesRepository: context.read<DataRepository<Headline>>(),
               topicsRepository: context.read<DataRepository<Topic>>(),
               sourcesRepository: context.read<DataRepository<Source>>(),
-            ),
+              countriesRepository: context.read<DataRepository<Country>>(),
+              languagesRepository: context.read<DataRepository<Language>>(),
+            )..add(const SharedDataRequested()),
           ),
           BlocProvider(
             create: (context) => DashboardBloc(