Common: Support import the exist file in object storage.

[baifachuan]

#3663

What problem does this PR solve?

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

Type of change

• New Feature (non-breaking change which adds functionality)

[baifachuan]

[yingfeng]

Hi, thanks for your contribution!
This PR will block CI, could you please figure out the reason and submit fix? Thank you!

[Feiue]

2024-12-18 11:08:14 ragflow-server  | Traceback (most recent call last):
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/api/apps/storage_app.py", line 35, in list_storage_keys
2024-12-18 11:08:14 ragflow-server  |     files = STORAGE_IMPL.list(None, dir)
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/rag/utils/minio_conn.py", line 62, in list
2024-12-18 11:08:14 ragflow-server  |     data = [{"name": key.object_name, "size": key.size, "etag": key.etag, "owner": key.owner_name} for key in keys]
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/rag/utils/minio_conn.py", line 62, in <listcomp>
2024-12-18 11:08:14 ragflow-server  |     data = [{"name": key.object_name, "size": key.size, "etag": key.etag, "owner": key.owner_name} for key in keys]
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/.venv/lib/python3.10/site-packages/minio/api.py", line 3111, in _list_objects
2024-12-18 11:08:14 ragflow-server  |     response = self._execute(
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/.venv/lib/python3.10/site-packages/minio/api.py", line 437, in _execute
2024-12-18 11:08:14 ragflow-server  |     region = self._get_region(bucket_name)
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/.venv/lib/python3.10/site-packages/minio/api.py", line 494, in _get_region
2024-12-18 11:08:14 ragflow-server  |     response = self._url_open(
2024-12-18 11:08:14 ragflow-server  |   File "/ragflow/.venv/lib/python3.10/site-packages/minio/api.py", line 423, in _url_open
2024-12-18 11:08:14 ragflow-server  |     raise response_error
2024-12-18 11:08:14 ragflow-server  | minio.error.S3Error: S3 operation failed; code: NoSuchBucket, message: The specified bucket does not exist, resource: /bucket, request_id: 181226A477AEFD17, host_id: dd9025bab4ad464b049177c95eb6ebf374d3b3fd1af9251148b658df7ac2e3e8, bucket_name: bucket

I have already added the relevant information for import_bucket in both service_conf.yaml and service_conf.yaml.template, but it seems the error still occurs.

[Feiue]

I'm getting a message here that s3_logger does not exist in the settings.