TF-56 Add object upload request & response and widget builder

model/lib/upload/upload_request.dart

@@ -0,0 +1,17 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/account_id.dart';
+import 'package:model/model.dart';
+
+class UploadRequest with EquatableMixin {
+
+  final Uri uploadUrl;
+  final FileInfo fileInfo;
+  final AccountId accountId;
+  final AccountRequest accountRequest;
+
+  UploadRequest(this.uploadUrl, this.accountId, this.fileInfo, this.accountRequest);
+
+  @override
+  List<Object?> get props => [uploadUrl, accountId, fileInfo, accountRequest];
+}