TF-3985 Navigate Paywall url when click Increase your space button

lib/features/paywall/data/datasource/paywall_datasource.dart

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+import 'package:tmail_ui_user/features/paywall/domain/model/paywall_url_pattern.dart';
+
+abstract class PaywallDatasource {
+  Future<PaywallUrlPattern> getPaywallUrl(String baseUrl);
+}

lib/features/paywall/data/datasource_impl/paywall_datasource_impl.dart

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+import 'package:tmail_ui_user/features/mailbox_dashboard/data/network/linagora_ecosystem_api.dart';
+import 'package:tmail_ui_user/features/paywall/data/datasource/paywall_datasource.dart';
+import 'package:tmail_ui_user/features/paywall/domain/model/paywall_url_pattern.dart';
+import 'package:tmail_ui_user/main/exceptions/exception_thrower.dart';
+
+class PaywallDatasourceImpl extends PaywallDatasource {
+  final LinagoraEcosystemApi _linagoraEcosystemApi;
+  final ExceptionThrower _exceptionThrower;
+
+  PaywallDatasourceImpl(this._linagoraEcosystemApi, this._exceptionThrower);
+
+  @override
+  Future<PaywallUrlPattern> getPaywallUrl(String baseUrl) {
+    return Future.sync(() async {
+      return await _linagoraEcosystemApi.getPaywallUrl(baseUrl);
+    }).catchError(_exceptionThrower.throwException);
+  }
+}

lib/features/paywall/data/repository/paywall_repository_impl.dart

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+import 'package:tmail_ui_user/features/paywall/data/datasource/paywall_datasource.dart';
+import 'package:tmail_ui_user/features/paywall/domain/model/paywall_url_pattern.dart';
+import 'package:tmail_ui_user/features/paywall/domain/repository/paywall_repository.dart';
+
+class PaywallRepositoryImpl extends PaywallRepository {
+  final PaywallDatasource _paywallDatasource;
+
+  PaywallRepositoryImpl(this._paywallDatasource);
+
+  @override
+  Future<PaywallUrlPattern> getPaywallUrl(String baseUrl) {
+    return _paywallDatasource.getPaywallUrl(baseUrl);
+  }
+}