Fix Arrow relationship C API adapter#19
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Summary
Fix the standalone C-API Python backend for Arrow relationship table creation.
The high-level
Connection.create_arrow_rel_table()wrapper now passeslayoutandindptr_dataframethrough for both flat and CSR relationship tables, but the ctypes backend still only accepted the older flat-table call shape. This caused CI to fail with a positional argumentTypeErrorbefore the C API could run.This change adds the CSR C API function signature to the ctypes adapter and dispatches flat and CSR layouts to the appropriate C API entry point.