feat: Implement switching between accounts (multi user support), still WIP

lib/features/settings/model/user_settings.dart

@@ -0,0 +1,14 @@
+import 'package:hive/hive.dart';
+import 'package:paperless_mobile/core/config/hive/hive_config.dart';
+
+part 'user_settings.g.dart';
+
+@HiveType(typeId: HiveTypeIds.userSettings)
+class UserSettings with HiveObjectMixin {
+  @HiveField(0)
+  bool isBiometricAuthenticationEnabled;
+
+  UserSettings({
+    this.isBiometricAuthenticationEnabled = false,
+  });
+}