Travshacl

- Raise `NotImplementedError` stating that an unsupported feature was used instead of `UnboundLocalError: cannot access local variable 'dict_1'`

- Add feature to pass an `rdflib.Graph` instead of a schema directory

- Add feature to validate private SPARQL endpoints via HTTP Basic Auth
- Add Python 3.12 support
- Minor maintenance updates

- Fix necessity of adding a slash (/) at the end of the output path
- Update trace keeping
- Minor updates of documentation

- Fix parameter `endpoint` for Flask app
- Reduce the number of entities in the example
- Update the Python version for the Docker image (3.9.13 to 3.11.5)
- Update the Virtuoso version in tests and example to 7.2.10
- Update GitHub Action for the test suite to run in parallel
- Update init method of `ShapeSchema`
- All parameters are now keyword-only and typed
- Only `shape_dir` and `endpoint` are required
- Add default values for the remaining parameters
- Code clean up and structural improvements
- Add documentation to GitHub pages

- The raw representation of OR constraints is no longer kept after parsing the constraint
- Fix issue with OR query when there are no constraints