Fix + enhance CTE.queryset()

[us77ipis]

• Fix some queries involving aggregates throwing an exception on execution
• Consistently allow to reannotate any field names when querying from a CTE
• For Django >= 5.2:
  • Guarantee, in accordance with the new Django 5.2 behavior, the order of the selected fields when querying from a CTE without calling again values() or values_list() on the queryset
  • Propagate correct values_list() behavior when querying from a CTE

[millerdev]

@us77ipis thanks for improving django-cte. Do the changes in this PR break backward compatibility in a way that we need to announce, and possibly bump the minor version number?

[millerdev]

Left a bunch of nitpicky comments, but this is looking good.

[millerdev]

@us77ipis, Thank you!