- Added new methods for handling giveaways: `giveaway_premium` and `giveaway_stars`.
- Refactored existing purchase methods into separate files: `purchase_premium.py` and `purchase_stars.py`.
- Removed old premium and stars methods from the codebase.
- Updated `__init__.py` to include new giveaway methods in the public API.
- Introduced new result types for giveaways: `PremiumGiveawayResult` and `StarsGiveawayResult`.
- Updated constants for new giveaway pages.
- Enhanced error handling for configuration and user validation in giveaway methods.
- Updated tests to cover new functionality and refactored existing tests to match new method locations.
bohd4nx