Flexible Data Storage and Subtle Performance Optimizations

• Enhanced with optional storage parameter to select between DataFrame and SQLite formats for data extraction, improving flexibility.
• Renamed internal attributes and methods for consistency:
  • codigos to codes in GET and largeGET methods.
  • Hacha class renamed to Axe, with methods updated to slice and forge.
• Refined caching logic:
  • Added SQLite-based caching for optimized performance in large data requests.
  • Implemented save_to_sqlite, load_from_sqlite, and save_chunk_to_sqlite methods for efficient chunk storage.
• Updated MetadataHandler with robust fallback loading for metadata and improved error handling.
• Bumped documentation and version numbers to align with 3.0 release.