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Add Python class support via Structure types with index-based member access (#423)

* Initial plan

* Add Structure type bindings and Python class support

- Added Structure type to py_types.cpp with Python bindings
- Extended _map_python_type to handle Python classes as Structure types
- Extended _infer_type to handle class instances
- Updated _type_to_str to handle Structure types in signatures
- Added test_classes.py with basic class support tests

Co-authored-by: lukastruemper <31564409+lukastruemper@users.noreply.github.com>

* Add structure definition support and class member access

- Added add_structure method to PyStructuredSDFGBuilder
- Implemented Python binding for add_structure
- Extended expression visitor to handle class member access via tasklets
- Added automatic structure registration for class arguments
- Updated tests with realistic expectations about current capabilities

Co-authored-by: lukastruemper <31564409+lukastruemper@users.noreply.github.com>

* Address code review feedback

- Use __dict__ instead of dir() for member introspection
- Fix type checking order (bool before int)
- Add TODO comment about member type lookup limitation
- Add support for more numeric types in member introspection

Co-authored-by: lukastruemper <31564409+lukastruemper@users.noreply.github.com>

* Add TODO comments for future improvements

- Add note about using numpy abstract types for better coverage
- Add performance optimization note for structure lookup
- Add explanation for using private function in tests
- Document all known limitations with actionable TODOs

Co-authored-by: lukastruemper <31564409+lukastruemper@users.noreply.github.com>

* Map structure members to indices in memlet subsets

- Track member name to (index, type) mapping during structure registration
- Use member index in memlet subset for structure member access
- Remove C++ pointer syntax from tasklet (use subset instead)
- Add structure_member_info parameter to AST parser and... (continued)

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