[Python APIView] Display inherited instance variables

[Copilot]

Feature

This PR adds support for displaying inherited instance variables (ivars) in Python APIView, making the API documentation more complete and easier to understand.

Previously, the Python APIView would only display instance variables defined in a class's own docstring. With this change, it now also displays instance variables inherited from parent classes, as long as those parent classes are part of the Azure SDK (specified by the package root namespace).

Implementation

• Updated _parse_ivars() method in ClassNode to traverse the class hierarchy using __mro__ (Method Resolution Order)
• Added logic to skip duplicate ivars (if a child class overrides an ivar from a parent)
• Added comprehensive test case with a child class inheriting from a parent with documented ivars

Example

Before this change, a child class would only show its own ivars:

class ChildClass(ParentClass):
    """Child class
    
    :ivar str child_name: Child-specific property
    """
    # Only shows child_name, not parent ivars

After this change, the child class shows both its own ivars and those inherited from parent classes:

class ChildClass(ParentClass):
    """Child class
    
    :ivar str child_name: Child-specific property
    """
    # Shows both child_name and all parent ivars

Fixes #9160.

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[github-actions]

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