Add exceptiongroup support to third party projects

As requested on https://github.com/python-trio/trio/pull/2213, we should try to add exceptiongroup support to both IPython and Apport. This issue tracks all efforts to add exceptiongroup support to other projects.

IPython seems to use customized versions of `format_exception()` and `format_exception_only()`, so it's likely to need an update to display exception groups, even on Python 3.11.

Apport, on the other hand, uses `format_exc()` and `print_exc()` straight from the `traceback` module, so a conditional import might do the trick.