dev.knotless.getRepoStorage

What a repository's packs take up on its owner's PDS, as `knotless repo storage` counts them: counted again only once a write to the repository's packs, claims or refs is seen (for a private one, once a sync of its space finds a write there), or compaction from these pages folds them. Apart from dev.knotless.getRepoSettings, as counting reads every pack record from the PDS.