Add vacuum RemoveBlobs test and benchmarks

João Pereirarequested to merge
10-add-blob-deletion-tests into 10-optimize-the-s3-storage-driver-s-delete-function

This change is part of !24 (merged) and related to #10 (closed).

Adds a test and benchmarks for the new storage.vacuum.RemoveBlobs method. We'll need these for comparison with the the previously used storage.vacumm.RemoveBlob method.

Edited by João Pereira

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