Nti.property

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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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- Make ``Tunable`` search harder (farther up the call chain)
to find a logger. This should make finding a logger in a
class definition better.

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- Updates to documentation and logging for tunables.

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- Add support for Python 3.12.
- Drop runtime dependency on setuptools in favor of "native namespace
packages".
- Drop support for legacy Python versions: 2.7, 3.6. 3.7, 3.8 and 3.9.
- Add new module ``nti.property.tunables`` for customizing parameters
(usually represented as class variables) from the environment.