feat: Handle S3 region

[NickLarsenNZ]

Description

Part of stackabletech/issues#696.

Note

S3a seems to do some region parsing from the URL instead of leaving it to the AWS SDK (if I interpreted the docs correctly).
See:

• https://hadoop.apache.org/docs/r3.4.1/hadoop-aws/tools/hadoop-aws/connecting.html#Region_and_endpoints_misconfigured
• https://hadoop.apache.org/docs/r3.4.1/hadoop-aws/tools/hadoop-aws/third_party_stores.html

Definition of Done Checklist

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Author

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1. Changes are OpenShift compatible
2. CRD changes approved
3. Integration tests passed (for non trivial changes)

Reviewer

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1. Code contains useful comments
2. Code contains useful logging statements
3. (Integration-)Test cases added
4. Documentation added or updated. Follows the style guide.
5. Changelog updated
6. Cargo.toml only contains references to git tags (not specific commits or branches)

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1. Feature Tracker has been updated
2. Proper release label has been added
3. Roadmap has been updated