Storage: Support the s3, azure blob as the object storage of ragflow. (#2278)

### What problem does this PR solve?

issue: https://github.com/infiniflow/ragflow/issues/2277

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [x] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

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

rag/svr/cache_file_svr.py

@@ -20,7 +20,7 @@ import traceback
 from api.db.db_models import close_connection
 from api.db.services.task_service import TaskService
 from rag.settings import cron_logger
-from rag.utils.minio_conn import MINIO
+from rag.utils.storage_factory import STORAGE_IMPL
 from rag.utils.redis_conn import REDIS_CONN
 
 
@@ -42,7 +42,7 @@ def main():
                 try:
                     key = "{}/{}".format(kb_id, loc)
                     if REDIS_CONN.exist(key):continue
-                    file_bin = MINIO.get(kb_id, loc)
+                    file_bin = STORAGE_IMPL.get(kb_id, loc)
                     REDIS_CONN.transaction(key, file_bin, 12 * 60)
                     cron_logger.info("CACHE: {}".format(loc))
                 except Exception as e: