Explicit re-exports of submodules in distutils.command.__all__

[Avasam]

This fixes an issue that makes mypy.stubtest fail when trying to compare stubs with this runtime.
This is also flagged by pyright's reportUnsupportedDunderAll

Aesthetic change: I sorted the content of __all__ to match the imports.

[abravalheri]

@jaraco, in pypa/setuptools#4902 I hypothesized that eagerly importing the command modules in command/__init__.py affected the end result of setuptools.monkey.patch_all:

• Previous to this PR the modules were imported late, so by the time they were executed distutils.core.Command was already patched to setuptools.Command.
• Now, the modules are executed before the patch.

The following experiment seems to corroborate this conclusion:

> docker run --rm -it python:3.10-bookworm /bin/bash
python -m pip install 'setuptools==77.0.1'
python
>>> import setuptools
>>> from distutils.command.sdist import sdist
>>> sdist.__mro__
(<class 'distutils.command.sdist.sdist'>, <class 'setuptools.Command'>, <class 'distutils.cmd.Command'>, <class 'object'>)


python -m pip install 'setuptools @ https://github.com/pypa/setuptools/archive/refs/tags/v77.0.2.zip'   
# tag not published to PyPI.
python
>>> import setuptools
>>> from distutils.command.sdist import sdist
>>> sdist.__mro__
(<class 'distutils.command.sdist.sdist'>, <class 'distutils.cmd.Command'>, <class 'object'>)

I don't know if there are the deeper unforeseen consequences of this change (other than problems similar to pypa/setuptools#4902).

[Avasam]

@abravalheri Instead of a revert, could you simply put the imports behind a if TYPE_CHECKING block for static tooling? (not 100% sure if that's enough for stubtest or not, but at least no more early import at runtime)

[jaraco]

I accepted this PR without thinking about it too hard, thinking it was just some syntactic cleanup, but I see now it's meaningfully changed the behavior.

The problem is that mypy and pyright expect a very regimented, uninteresting use of __all__. Probably if written today, __all__ would better be replaced by a distutils-specific property (all_ maybe).

@abravalheri Instead of a revert, could you simply put the imports behind a if TYPE_CHECKING block for static tooling? (not 100% sure if that's enough for stubtest or not, but at least no more early import at runtime)

Let's confirm that it's enough for stubtest. I don't want to employ a fix that has no effect. My instinct, let's just revert this change for now and work out the appropriate solution in light of the troubles. I still need to review the proposed changes and the bug report, but I'll get something out soon.