fix (s3): s3 rename - #421
fix (s3): s3 rename - #421

* fix MV function in the S3 backend

* fix space encoding

Co-authored-by: Quentin Bramas <fa39bdc32115035effac9cdb73eff395ffcd40b2@unistra.fr>
mickael-kerjean/nuage,mickael-kerjean/nuage,mickael-kerjean/nuage,mickael-kerjean/nuage,mickael-kerjean/nuage,mickael-kerjean/nuage