s3: add Clever Cloud Cellar provider

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Cellar is the S3-compatible object storage service of Clever Cloud,
hosted in France.

rclone's defaults work for it: virtual-host style addressing, v2
listings, URL-encoded listings and BucketAlreadyExists behave like AWS.

Cellar does not apply Object Lock headers sent with
CreateMultipartUpload, so object_lock_supported is set to false and the
Object Lock integration tests are skipped. The docs tell users to set
--s3-object-lock-set-after-upload, which applies the lock on multipart
uploads with separate API calls.

The SSE-C options are exposed since Cellar supports customer-provided
keys. The docs note that Cellar rejects CopyObject with an SSE-C source,
so --no-update-modtime is needed and encrypted objects smaller than
--s3-copy-cutoff can't be moved server-side.

The integration tests pass against cellar-c2.services.clever-cloud.com.

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