Add missing exception classes in setuptools.errors

[maresb]

As part of the distutils deprecation implemented in #9795 by @Avasam, several distutils-related exceptions were removed from setuptools.errors. I think that some exceptions may have unintentionally been removed, so I have added them back in this PR.

Indeed, evidence that setuptools.errors should not be entirely deprecated can be found in PEP 632, where setuptools is suggested as a substitute for distutils.errors.

[Avasam]

I think that some exceptions may have unintentionally been removed, so I have added them back in this PR.

Small correction:
I don't think anything was removed from setuptools.errors (https://github.com/python/typeshed/pull/9795/files#diff-7881e6b106cbf3dcded0f78acc68b6b1144200ed8d6f96d7bb6e8cdbffc9eda2), it's more like they've always been missing, because setuptools/METADATA.toml has ignore_missing_stub = true https://github.com/python/typeshed/blob/main/stubs/setuptools/METADATA.toml#L4

So thanks for adding missing stubs!

[AlexWaygood]

Small correction:
I don't think anything was removed from setuptools.errors (https://github.com/python/typeshed/pull/9795/files#diff-7881e6b106cbf3dcded0f78acc68b6b1144200ed8d6f96d7bb6e8cdbffc9eda2), it's more like they've always been missing, because setuptools/METADATA.toml has ignore_missing_stub = true https://github.com/python/typeshed/blob/main/stubs/setuptools/METADATA.toml#L4

This is true, but it is also true, looking at it again, that many exception classes were removed from setuptools/_distutils/errors.pyi, meaning users can no longer import them from setuptools._distutils.errors: https://github.com/python/typeshed/pull/9795/files#diff-8a7c86f8b0bf8367e2bbc71a6168e13ae3b279440ab5775da788c36a502854eeR1-L19. These classes weren't then added to setuptools/errors.pyi, so users now have nowhere they can import them from. This was probably an oversight :)

[AlexWaygood]

Thanks! I've tweaked the PR a little bit so that it's a bit more faithful to what happens at runtime. Will merge once CI passes.

[Avasam]

Given the push for the deprecation of distutils, it'd be a good idea indeed to ensure that all stubs in setuptools are accounted for. There aren't too many stubtest errors left. I should have a PR ready pretty soon.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

sphinx (https://github.com/sphinx-doc/sphinx)
- sphinx/setup_command.py:23:5: error: Module "setuptools.errors" has no attribute "ExecError"  [attr-defined]
+ sphinx/setup_command.py:26:5: error: Incompatible import of "ExecError" (imported name has type "Type[distutils.errors.DistutilsExecError]", local name has type "Type[setuptools._distutils.errors.DistutilsExecError]")  [assignment]

[maresb]

Awesome, thanks so much for the extremely fast response!!!