ocis: New ocis command: Add CLI command to test Blobstore

> Migrated from owncloud/docs-ocis#1287 — opened by @mmattel on 2026-07-14.
> Original: https://github.com/owncloud/docs-ocis/issues/1287
> Addressed by #62 in this repo (port of owncloud/docs-ocis#1286).

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References: https://github.com/owncloud/ocis/pull/12102 (Add CLI command to test Blobstore)

Released with 8.1
