alytantawyy opened a new pull request, #50167:
URL: https://github.com/apache/arrow/pull/50167
### Rationale for this change
The S3 filesystem metadata handling supported headers such as `Content-Type`,
`Content-Language`, `Cache-Control`, and `Expires`, but omitted
`Content-Encoding`.
As a result, `Content-Encoding` was not propagated when writing S3 object
metadata, and it was also not returned when reading metadata back.
### What changes are included in this PR?
- add `Content-Encoding` to S3 object metadata extraction
- add `Content-Encoding` to the S3 metadata setter whitelist
- add a dedicated setter for `Content-Encoding`
- extend the S3 metadata round-trip test to cover explicit and default
`Content-Encoding` metadata
### Are these changes tested?
Yes.
```text
./cpp/build-s3-system/debug/arrow-s3fs-test
--gtest_filter=TestS3FS.OpenOutputStreamMetadata
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