Keeping the lexical order same add optimizations, provide a comprehensive response from ListObjects()

pkg/storage/donut/definitions.go

@@ -64,3 +64,10 @@ type BucketMetadata struct {
 	Metadata      map[string]string      `json:"metadata"`
 	BucketObjects map[string]interface{} `json:"objects"`
 }
+
+// ListObjects container for list objects response
+type ListObjects struct {
+	Objects        []string `json:"objects"`
+	CommonPrefixes []string `json:"commonPrefixes"`
+	IsTruncated    bool     `json:"isTruncated"`
+}