feat: add s3 bucket creation for rustfs

[tmorrell]

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Description

Requires inveniosoftware/invenio-s3#55. RustFS doesn't create a bucket automatically like minio did.

Claude assisted with this code.

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[Samk13]

Could we assert the “already exists” case here?
Checking only the exit code doesn’t verify that the FileExistsError branch was exercised.