feat: implement bulk task addition and deletion in TaskWarrior server

- Added `add_tasks` method to allow adding multiple tasks in a single call, enhancing efficiency and usability.
- Updated `delete_task` method to accept a list of UUIDs for deleting multiple tasks, improving flexibility.
- Implemented validation to ensure that at least one UUID is provided for deletion.
- Enhanced unit tests to cover scenarios for adding multiple tasks, including edge cases for empty lists and single task addition.
- Improved docstrings for clarity, detailing parameters, return values, and usage examples.

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