feat: enhance email and slot manager activities with new filtering and caching functionalities
- Updated Email class to improve attachment handling and logging.
- Refactored Formatters class to process notifications more effectively by grouping them based on their configurations.
- Introduced new methods in SlotManager for filtering notification alerts and storing notification cache.
- Enhanced Alerts workflow to integrate new filtering and caching activities.
- Added tests for new functionalities in SlotManager and Formatters classes to ensure reliability.
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