feat: implement task modification functionality in TaskWarrior server

- Added `modify_task` method to allow modification of tasks based on a filter expression, supporting parameters for project, priority, due date, description, and tags.
- Implemented validation for modification parameters, ensuring at least one parameter is provided and that priority and tag formats are correct.
- Introduced corresponding tests to validate the functionality of task modifications, including edge cases for invalid inputs and multiple modifications.
- Enhanced docstrings for clarity and detailed usage examples.

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