Enhance error messages in TaskWaiter extensions to include error details

Author: ahmednfwela

lib/src/results/task_error.dart

@@ -17,4 +17,9 @@ class TaskError {
         type: map['type'] as String?,
         link: map['link'] as String?,
       );
+
+  @override
+  String toString() {
+    return 'TaskError{message: $message, code: $code, type: $type, link: $link}';
+  }
 }

test/utils/wait_for.dart

@@ -16,7 +16,7 @@ extension TaskWaiter on Task {
       if (task.status != 'enqueued' && task.status != 'processing') {
         if (throwFailed && task.status != 'succeeded') {
           throw MeiliSearchApiException(
-            "Task ($uid) failed",
+            "Task ($uid) failed, error: ${task.error}",
             code: task.error?.code,
             link: task.error?.link,
             type: task.error?.type,
@@ -55,7 +55,7 @@ extension TaskWaiterForLists on Iterable<Task> {
             .firstWhereOrNull((element) => element.status != 'succeeded');
         if (failed != null) {
           throw MeiliSearchApiException(
-            "Task (${failed.uid}) failed",
+            "Task (${failed.uid}) failed, error: ${failed.error}",
             code: failed.error?.code,
             link: failed.error?.link,
             type: failed.error?.type,