added iap stub methods

iap/lib/m3_lightmeter_iap.dart

@@ -5,5 +5,6 @@ import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 export 'src/data/models/iap_product.dart';
 export 'src/providers/iap_products_provider.dart';
 export 'src/data/iap_storage_service.dart';
+export 'src/data/films_storage_service.dart';
 
 const List<Film> films = [];

iap/lib/src/data/films_storage_service.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/foundation.dart';
+import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
+
+typedef SelectableFilm<T extends Film> = ({T film, bool isUsed});
+
+class FilmsStorageService {
+  FilmsStorageService();
+
+  Future<void> init() async {}
+
+  @visibleForTesting
+  Future<void> createTable(dynamic _) async {}
+
+  String get selectedFilmId => '';
+  set selectedFilmId(String id) {}
+
+  Future<void> addFilm(FilmExponential _) async {}
+
+  Future<void> updateFilm(FilmExponential _) async {}
+
+  Future<void> toggleFilm(Film _, bool __) async {}
+
+  Future<void> deleteFilm(FilmExponential _) async {}
+
+  Future<Map<String, SelectableFilm<Film>>> getPredefinedFilms() async {
+    return const {};
+  }
+
+  Future<Map<String, SelectableFilm<FilmExponential>>> getCustomFilms() async {
+    return const {};
+  }
+}

iap/lib/src/data/iap_storage_service.dart

@@ -8,10 +8,4 @@ class IAPStorageService {
 
   List<EquipmentProfile> get equipmentProfiles => [];
   set equipmentProfiles(List<EquipmentProfile> profiles) {}
-
-  Film get selectedFilm => const FilmStub();
-  set selectedFilm(Film value) {}
-
-  List<Film> get filmsInUse => [];
-  set filmsInUse(List<Film> profiles) {}
 }