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### What problem does this PR solve? This PR fixes two issues in the OpenDAL storage connector: 1. The `health` method was missing, which prevented health checks on the storage backend. 3. The initialization of the `opendal.Operator` object included a redundant scheme parameter, causing unnecessary duplication and potential confusion. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) ### Background - The absence of a `health` method made it difficult to verify the availability and reliability of the storage service. - Initializing `opendal.Operator` with both `self._scheme` and unpacked `**self._kwargs` could lead to errors or unexpected behavior if the scheme was already included in the kwargs. ### What is changed and how it works? - Adds a `health` method that writes a test file to verify storage availability. - Removes the duplicate scheme parameter from the `opendal.Operator` initialization to ensure clarity and prevent conflicts. before: <img width="762" alt="企业微信截图_46be646f-2e99-4e5e-be67-b1483426e77c" src="https://github.com/user-attachments/assets/acecbb8c-4810-457f-8342-6355148551ba" /> <img width="767" alt="image" src="https://github.com/user-attachments/assets/147cd5a2-dde3-466b-a9c1-d1d4f0819e5d" /> after: <img width="1123" alt="企业微信截图_09d62997-8908-4985-b89f-7a78b5da55ac" src="https://github.com/user-attachments/assets/97dc88c9-0f4e-4d77-88b3-cd818e8da046" />