Handle unusual __qualname__ in inspect

[SebastianSpeitel]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate (see note about typos above).
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

I discovered, that an object with an unusual __qualname__ attribute (not a str, e.g. a descriptor) causes inspect to fail.
This can happen if an object is created this way intentionally, but I discovered it, when decorating a class with @functools.lru_cache which forwards the underlying attributes using a descriptor when it can't add the to it's __dict__ because the class uses __slots__:

from functools import lru_cache
from rich import inspect


@lru_cache
class Klaas:
    __slots__ = ("__qualname__",)


if __name__ == "__main__":
    from rich.traceback import install

    install()

    inspect(Klaas.__qualname__)
    inspect(Klaas, all=True)

I fixed it by checking the type of __qualname__ falling back to __name__ and if that isn't a str using the already provided fallback.