Feature request: Add option to create blobs in a random virtual directory up to N levels deep

Having an option to create blobs in random virtual directories up to N levels deep to allow not only for data load, but also to test listing operations such as recursive lists by delimiter.

Start by locating the sample application's blob-generation and upload entry points. Review how generated files and upload options are configured, then determine how random virtual-directory depth should be exposed and verified. Done means blobs can be generated at random directory depths up to the requested limit and listing behavior can be exercised.

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