cloud drive: add support for Aliyun OSS

other/java/client/src/main/proto/filer.proto

@@ -395,12 +395,19 @@ message RemoteConf {
     string s3_endpoint = 7;
     string s3_storage_class = 8;
     bool s3_force_path_style = 9;
+
     string gcs_google_application_credentials = 10;
+
     string azure_account_name = 15;
     string azure_account_key = 16;
+
     string backblaze_key_id = 20;
     string backblaze_application_key = 21;
     string backblaze_endpoint = 22;
+
+    string aliyun_access_key = 25;
+    string aliyun_secret_key = 26;
+    string aliyun_endpoint = 27;
 }
 
 message RemoteStorageMapping {