…reporting

- Added functionality to run unit tests using pytest within the run_checks script.
- Implemented detailed reporting of test results, including counts of passed, failed, and skipped tests.
- Updated the script to provide tips for resolving type and test failures.
- Refactored imports in various files to accommodate new preprocessing structure.
- Removed obsolete test files and added new unit test notebooks for trajectory tokenization.

…d initialization

- Updated expected tokenization results for the capital of France to reflect the correct answer "Paris" instead of "London".
- Added random seed initialization to ensure reproducibility in tests.
- Refactored imports and code structure for clarity.

- Improved the run_checks script to include detailed unit test execution and summary reporting.
- Added functionality to parse and display test results, including counts of passed, failed, and skipped tests.
- Updated the unit test notebook to correct tokenization results for the capital of France and ensure reproducibility with a fixed random seed.
- Refactored code structure for clarity and maintainability.