Plateau

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* Add ``is distinct from`` predicate operation. This follows the behaviour of the SQL operation of the same name, i.e. it treats two null values as the same. This is also the current behaviour of the ``!=`` operation.
* Deprecates the current behaviour of the ``!=`` predicate operation. From 5.0.0 onwards, the new behaviour will be the same as its SQL counterpart, i.e. it will filter out null/missing values. Where the current behaviour of ``!=`` is needed, ``is distinct from`` should be used instead.
* Include pyarrow 14.0.1 in CI

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* Include Python 3.12 in CI
* Migrate setup.cfg to pyproject.toml completely
* Port to ruff, remove isort, black, and flake8

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* Add support for pandas 2.1
* Fix a bug to do with timestamp dtype conversion
* Add timestamp unit coercion as Plateau currently only supports nanosecond units on timestamps

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* Support pandas 2
* Test pyarrow 12 and 13
* Prevent dask from casting all object dtypes to strings
* Remove tests for pyarrow<=3 as they fail with pandas>=2
* Adds support for dask 2023.9.2

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* Enable dask column projection.
* Test pyarrow 11
* Remove usage of ``pkg_resources``.

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* We no longer package the ``tests`` directory.
* Test pyarrow 10 and Python 3.11, pandas 1.5