Pueblo

- nlp: Updated dependencies langchain, langchain-text-splitters, unstructured
- CI: Verify compatibility with Python 3.13
- Testing: Add `pueblo.testing.notebook.{list_notebooks,generate_notebook_tests,run_notebook}`

- Testing: Add `pueblo.testing.notebook.{list_path,generate_tests}`

- ngr: Add capability to invoke Python's built-in `unittest`

- Testing: Add `pueblo.testing.pandas.{makeTimeDataFrame,makeMixedDataFrame}`.
They have been removed from `pandas._testing` on behalf of pandas 2.2.0.

- Packaging: Fix `MANIFEST.in`

- Dependencies: Update to pytest-notebook >=0.10,
lower versions are not compatible any longer
- ngr: Add capability to invoke Meltano projects