show Python 3.11 traceback information in debugger

[davidism]

Python 3.11 adds fine grained location information to tracebacks, and uses it to print an arrow under the code line. Figure out how to get this information from the traceback objects and use it to draw the same output in the interactive debugger.

[EthanAMoss]

I'm at PyCon and I'll take this on

[davidism]

Also verify that ExceptionGroup errors render correctly, they have some additional output as well but I think that might already be handled by the existing formatting.