Setuptools

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Misc
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* 3836: Fixed interaction between ``setuptools``' package auto-discovery and
auto-generated ``htmlcov`` files.

Previously, the ``htmlcov`` name was ignored when searching for single-file
modules, however the correct behaviour is to ignore it when searching for
packages (since it is supposed to be a directory, see `coverage config`_)
-- by :user:`yukihiko-shinoda`.

.. _coverage config: https://coverage.readthedocs.io/en/stable/config.html#html-directory
* 3838: Improved error messages for ``pyproject.toml`` validations.
* 3839: Fixed ``pkg_resources`` errors caused when parsing metadata of packages that
are already installed but do not conform with PEP 440.

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Changes
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* 3843: Although pkg_resources has been discouraged for use, some projects still consider pkg_resources viable for usage. This change makes it clear that pkg_resources should not be used, emitting a DeprecationWarning when imported.

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Changes
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* 3832: Update vendored ``importlib-metadata`` (to 6.0.0) and
``importlib-resources`` (to 5.10.2)

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Misc
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* 3820: Restore quoted ``include`` argument to ``has_function``.

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Misc
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* 3827: Improve deprecation warning message on ``pkg_resources.declare_namespace``
to display package name.

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Misc
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* 3823: Fixes ``egg_info`` code path triggered during integration with ``pip``.