Blueetl-core

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Bug fixes
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- Do not call ``get_reusable_executor().shutdown()`` when tasks are run serially in ``run_parallel()``.

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Improvements
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- In ``blueetl_core.utils.is_subfilter()``, add the ``strict`` parameter.

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Improvements
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- In ``blueetl_core.parallel.isolated()``, execute the function in the same process if ``BLUEETL_JOBLIB_JOBS`` is set to ``1``.

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New Features
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- Add ``blueetl_core.parallel.isolated()`` to execute a function in a separate subprocess.

Improvements
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- If the env variable ``BLUEETL_SUBPROCESS_LOGGING_LEVEL`` is empty or not defined, then the log level of the subprocesses is inherited from the parent.

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New Features
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- Add ``df.etl.insert_columns()`` to simplify the insertion of multiple columns at once in a DataFrame.

Improvements
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- In ``run_parallel()``, automatically shutdown the processes created by joblib and loky.

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Improvements
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- Update github actions.
- Split lint and docs jobs in the CI.
- Remove tox-gh-actions in the CI.
- Use tox-uv in the CI.
- Update black formatting.