feat: Adds Ownder data in ListObjects(V2) result.

Closes #819

ListObjects returns object owner data in each object entity in the result, while ListObjectsV2 has fetch-owner query param, which indicates if the objects owner data should be fetched.
Adds these changes in the gateway to add `Owner` data in `ListObjects` and `ListObjectsV2` result. In aws the objects can be owned by different users in the same bucket. In the gateway all the objects are owned by the bucket owner.

tests/integration/tests.go

@@ -4815,7 +4815,7 @@ func ListObjects_with_checksum(s *S3Conf) error {
 			return err
 		}
 
-		if !compareObjects(res.Contents, contents) {
+		if !compareObjects(contents, res.Contents) {
 			return fmt.Errorf("expected the objects list to be %v, instead got %v", contents, res.Contents)
 		}
 
@@ -4899,6 +4899,38 @@ func ListObjects_nested_dir_file_objs(s *S3Conf) error {
 	})
 }
 
+func ListObjects_check_owner(s *S3Conf) error {
+	testName := "ListObjects_check_owner"
+	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
+		objs, err := putObjects(s3client, []string{"foo", "bar/baz", "quxx/xyz/eee", "abc/", "bcc"}, bucket)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
+		res, err := s3client.ListObjects(ctx, &s3.ListObjectsInput{
+			Bucket: &bucket,
+		})
+		cancel()
+		if err != nil {
+			return err
+		}
+
+		for i := range res.Contents {
+			res.Contents[i].Owner = &types.Owner{
+				ID: &s.awsID,
+			}
+		}
+
+		if !compareObjects(objs, res.Contents) {
+			return fmt.Errorf("expected the contents to be %v, instead got %v", objs, res.Contents)
+		}
+
+		return nil
+
+	})
+}
+
 func ListObjectsV2_start_after(s *S3Conf) error {
 	testName := "ListObjectsV2_start_after"
 	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
@@ -5290,6 +5322,38 @@ func ListObjectsV2_list_all_objs(s *S3Conf) error {
 	})
 }
 
+func ListObjectsV2_with_owner(s *S3Conf) error {
+	testName := "ListObjectsV2_with_owner"
+	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
+		objs, err := putObjects(s3client, []string{"foo", "bar/baz", "quxx/xyz/eee", "abc/", "bcc"}, bucket)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
+		res, err := s3client.ListObjectsV2(ctx, &s3.ListObjectsV2Input{
+			Bucket:     &bucket,
+			FetchOwner: getBoolPtr(true),
+		})
+		cancel()
+		if err != nil {
+			return err
+		}
+
+		for i := range res.Contents {
+			res.Contents[i].Owner = &types.Owner{
+				ID: &s.awsID,
+			}
+		}
+
+		if !compareObjects(objs, res.Contents) {
+			return fmt.Errorf("expected the contents to be %v, instead got %v", objs, res.Contents)
+		}
+
+		return nil
+	})
+}
+
 func ListObjectsV2_with_checksum(s *S3Conf) error {
 	testName := "ListObjectsV2_with_checksum"
 	return actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {