Implement batch sending methods for the Transactional and Bulk email streams Reference: - [Batch Send Email (including Templates) API docs Transactional](https://api-docs.mailtrap.io/docs/mailtrap-api-docs/f96000c8de409-batch-send-email-including-templates) - https://api-docs.mailtrap.io/docs/mailtrap-api-docs/c323263dc45c5-batch-send-email-including-templates **Requirements:** - Add methods to support batch sending for both Transactional and Bulk streams. - Ensure the implementation also supports sending emails using templates, as per the Mailtrap API documentation linked above. - Update documentation and add unit tests covering the batch and template scenarios. **Acceptance Criteria:** - New batch send methods for Transactional and Bulk streams are available and documented. - Template support works for batch sends. - Code is covered by tests for both streams, single and batch scenarios, including templates.