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.

Written by the indexing model from the issue text.