Nti.testing

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- Nothing changed yet.

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- Nothing changed yet.

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- Add support for Python 3.13.
- Use native namespace packages.

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- Add support for, and require, testgres 1.10. This is needed because
they changed the signature for ``get_pg_version``.
- Drop support for Python 3.8 and 3.9.

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- Add support for Python 3.10, 3.11 and 3.12.
- Drop support for Python 2 and Python 3.6 and 3.7.
- Add a layer for working with a ``testgres`` Postgres instance.
- Add methods to the test base classes to support ``unittest.mock`` patches.

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- Add support for Python 3.9.

- Drop support for Python 3.5.

- Add the module alias ``nti.testing.mock``, which is either the
standard library ``unittest.mock``, or the backport ``mock``. This
allows easy imports when backwards compatibility matters.

- Make ``mock``, ``mock.Mock`` and various other API attributes,
like ``is_true``, available directly from the ``nti.testing`` namespace.