- Implemented GetAllProviders method in the Service to return all registered providers.
- Added TestGetAllProviders to validate the functionality, ensuring providers have required attributes and are unique.
- Enhanced GetPublicInfo method in provider implementations to return structured public information.
- Updated OpenAPI handlers to include endpoints for retrieving provider information, improving API usability.
- Introduced OnReceive method to register multiple message handlers for processing received messages.
- Added RemoveReceiveHandler method to unregister specific message handlers.
- Implemented TriggerWebhook method to process incoming webhook data and trigger registered handlers.
- Updated existing tests to reflect changes in provider types from 'smtp' to 'mailer' for consistency.
- Added context support to Send and SendBatch methods across all messenger providers (Twilio, Mailgun, SMTP).
- Implemented environment variable resolution in provider configurations to enhance flexibility.
- Updated Load function in the engine to include messenger loading, ensuring all components are initialized properly.
- Refactored related tests to validate new context handling and configuration parsing, improving overall robustness.
