Remove Python 3.14 non-compatibility, add autodoc extension that parses AssignedField doc comment

[ixjlyons]

https://docs.python.org/3/whatsnew/3.14.html#pep-649-pep-749-deferred-evaluation-of-annotations

[sixpearls]

This will likely to be resolved. sys._getframe(1) called from the BaseCondorClassDict.__setitem__ can be used to get the frame object for the class, find the annotate code object, "And then some more tricks to build a function object from the code object. But this will be fragile and not portable" per discussion with a Python core dev.

Best path forward is likely to remove this capability.