Refactor downloader and management commands for improved file handlin…

[marianoeramirez]

…g and bulk insert functionality

• Updated the Downloader class to use context managers for file and stream handling, enhancing resource management.
• Enhanced the needs_downloading method to support local file checks and HTTP HEAD requests for better efficiency.
• Introduced bulk_create functionality for country, region, and subregion imports in the management command, allowing for optimized database operations.
• Added a BULK_BATCH_SIZE setting to control the number of records processed in bulk, improving performance during imports.

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