Script: remove pkg_resources namespace declarations

[gforcada]

At some point, Plone 7(?), we should remove the already deprecated pkg_resources on __init__.py files to switch to native namespaces:

https://packaging.python.org/en/latest/guides/packaging-namespace-packages#native-namespace-packages

As that's meant to be a coordinated effort that has to happen on a 0-day, having a script to try apply that to the plone namespace would be critical.

[mauritsvanrees]

This does not have to be done in a single day. See my comment on zopefoundation/meta:

• You can install old and new style packages together.
• But editable installs get tricky.

So still it would be good to do this fast for a lot of packages, and quickly make alpha releases afterwards.

I think the time to do this would be somewhere in the second half of 2024.

[jensens]

Btw.: We should remove the whole namespace level __init__.py. They are not needed any longer with PEP420.

[jensens]

That said: I just played with PEP420 at the collective.elastic.plone package https://github.com/collective/collective.elastic.plone/tree/2-overhaul
It works. collective.elastic.ingest as its dependency is PEP420 too.
Both as editables here at the moment.

As an wheel there is collective.monkeypatcher as core dependency and this works too.
I am pretty sure it stops working if we install it as editable.

One observation: zope testrunner stops working, it does not discover tests in pep440 packages.
Good news: pytest with pytest-plone works, if the __init__.py from the tests folder was removed.
I just moved the whole tests folder to the top level, which works too, but I am not sure if this is the best approach.