adding cli functionality

[cdc-ap66]

[2025.10.31.0a]

Added

• New CLI commands for dataset management:
  • dataops_datasets: List available datasets with optional prefix filtering
  • dataops_stages: View available stages for a specific dataset
  • dataops_versions: List available versions for a dataset stage
  • dataops_save: Download and save dataset versions locally
• Tree utility function: New tree() function in utils.py for displaying directory structures
• Local data download: download_version_to_local() method for BlobEndpoint to download datasets to local filesystem
• Tests: Comprehensive test coverage for new CLI commands and utilities

Updated

• Documentation formatting: Changed "Description" to "Summary" with adjusted heading levels