[Python APIview] ivar annotations per PEP526 showing up as cvars

[kristapratico]

Context: https://apiview.dev/Assemblies/Review/f654d0b58676400a9fe225b5df013d73?diffRevisionId=c550c432e8eb485eac666b722bfcdcd4&diffOnly=True&revisionId=c5256ddacaff4b25b6f6eae95676fca5&doc=False#24bfe5a892a5434bb01aeb2d039909bd

PEP526: https://peps.python.org/pep-0526/#class-and-instance-variable-annotations

class BasicStarship:
    captain: str = 'Picard'                  # instance variable with default
    damage: int                                 # instance variable without default
    stats: ClassVar[Dict[str, int]] = {}  # class variable

captain and damage should be ivar in APIView, while stats should be cvar since it is explicitly marked.