Oss support opendal(including mysql) (#8204)

### What problem does this PR solve?

#8074
Oss support opendal(including mysql)

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

rag/utils/storage_factory.py

@@ -20,6 +20,7 @@ from enum import Enum
 from rag.utils.azure_sas_conn import RAGFlowAzureSasBlob
 from rag.utils.azure_spn_conn import RAGFlowAzureSpnBlob
 from rag.utils.minio_conn import RAGFlowMinio
+from rag.utils.opendal_conn import OpenDALStorage
 from rag.utils.s3_conn import RAGFlowS3
 from rag.utils.oss_conn import RAGFlowOSS
 
@@ -30,6 +31,7 @@ class Storage(Enum):
     AZURE_SAS = 3
     AWS_S3 = 4
     OSS = 5
+    OPENDAL = 6
 
 
 class StorageFactory:
@@ -39,6 +41,7 @@ class StorageFactory:
         Storage.AZURE_SAS: RAGFlowAzureSasBlob,
         Storage.AWS_S3: RAGFlowS3,
         Storage.OSS: RAGFlowOSS,
+        Storage.OPENDAL: OpenDALStorage
     }
 
     @classmethod