TF-3454 Download all attachments as ZIP

model/lib/download_all/download_all_capability.dart

@@ -0,0 +1,20 @@
+import 'package:jmap_dart_client/jmap/core/capability/capability_properties.dart';
+import 'package:json_annotation/json_annotation.dart';
+
+part 'download_all_capability.g.dart';
+
+@JsonSerializable(includeIfNull: false)
+class DownloadAllCapability extends CapabilityProperties {
+  DownloadAllCapability({this.endpoint});
+
+  final String? endpoint;
+
+  factory DownloadAllCapability.fromJson(Map<String, dynamic> json) => _$DownloadAllCapabilityFromJson(json);
+
+  Map<String, dynamic> toJson() => _$DownloadAllCapabilityToJson(this);
+
+  factory DownloadAllCapability.deserialize(Map<String, dynamic> json) => _$DownloadAllCapabilityFromJson(json);
+
+  @override
+  List<Object?> get props => [endpoint];
+}