Tracking issues of storage backend integration tests

[Xuanwo]

• [x] aws s3: tested by minio now. We can add real s3 bucket in with sponsor.
• [ ] aliyun oss: need an oss bucket (better to locate near us-east-1)
• [ ] azure adlsv2: can be tested by Azurite. And I'm willing to provide test infra as Microsoft MVP.
• [ ] gcp gcs: need a gcs bucket (better to locate near us-east-1)
• [ ] hadoop hdfs: can setup in CI directly (thanks open source!)

I agree that we can label these features as experimental. Setting up the CI infrastructure requires time, more so than implementing those features.

Originally posted by @Xuanwo in https://github.com/apache/iceberg-rust/issues/408#issuecomment-2178730480