Remove `setuptools` install dependency

[icemac]

FEATURE REQUEST

After switching our repositories to PEP 420 namespaces in #194 most of the packages will no longer need the setuptools install dependency and the ones which still use pkg_resouces need to to be switched to importlib.resources because pkg_resouces is deprecated and to be removed from setuptools soon (November 2025?).

Request:

• get rid of setuptools in setup.py als install_requires via the bin/config-package script and fix the fallout it might cause.
• Search for usage of pkg_resoures in the code and documentation config file.

Search link for packages still importing pkg_resources: https://github.com/search?q=org%3Azopefoundation+%22import+pkg_resources%22++NOT+is%3Aarchived&type=code

[dataflake]

Just FYI, I have already removed the setuptools install dependency on all maintained packages in the Products namespace and changed all Sphinx configurations in those packages where pkg_resources was used to determine the current version.

[dataflake]

The dependency is also gone from the c-code packages where I moved package metadata into pyproject.toml.

[dataflake]

I have added a search link to the issue description: https://github.com/search?q=org%3Azopefoundation+%22import+pkg_resources%22++NOT+is%3Aarchived&type=code