Fix missing class members in generated documentation

Fixes #1215 and #1100

After switching to nvidia-sphinx-theme in PR #874, class members
(properties, methods, attributes) were no longer being documented
in the generated HTML pages. This affected DeviceProperties and
other classes using the autosummary class template.

Root cause: The autoclass directive in the template was not
configured to document members. Added :members:, :undoc-members:,
and :show-inheritance: options to ensure all class members are
properly documented.

Changes:
- Added :members: option to include all class members
- Added :undoc-members: to include members without docstrings
- Added :show-inheritance: to display base classes

This restores the documentation to how it appeared before the
theme switch (see v0.3.2 for comparison).

Author: yashwantbezawada

cuda_core/docs/source/_templates/autosummary/class.rst

@@ -6,6 +6,9 @@
 .. currentmodule:: {{ module }}
 
 .. autoclass:: {{ objname }}
+   :members:
+   :undoc-members:
+   :show-inheritance:
 
    {% block methods %}
    {% if methods %}