FEAT: Adding rowID and rowvVer functions

[jahnvi480]

Work Item / Issue Reference

AB#34929
AB#34930

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Summary

This pull request adds support for retrieving special columns from a database table using the ODBC SQLSpecialColumns function. The main changes include new methods in the Python cursor for accessing row identifier and version columns, as well as the necessary C++ and Python bindings to expose this ODBC functionality. Additionally, relevant constants have been added to support these features.

New Python cursor methods:

• Added rowIdColumns and rowVerColumns methods to the Cursor class in mssql_python/cursor.py, allowing users to retrieve columns that uniquely identify a row (SQL_BEST_ROWID) and columns that are automatically updated when any value in the row is updated (SQL_ROWVER). These methods handle ODBC parameter preparation, call the new binding, and return results as row objects.

ODBC and pybind11 binding support:

• Defined the SQLSpecialColumnsFunc function pointer type and added the corresponding global pointer in mssql_python/pybind/ddbc_bindings.h and mssql_python/pybind/ddbc_bindings.cpp.
• Loaded the SQLSpecialColumnsW symbol from the ODBC driver in the driver loader, and included it in the function pointer validation check.
• Implemented the SQLSpecialColumns_wrap function to call the ODBC API, handling both Unix and Windows string conversions, and exposed it to Python as DDBCSQLSpecialColumns in the module definition.

Constants:

• Added new constants for SQL_SCOPE_CURROW, SQL_BEST_ROWID, SQL_ROWVER, SQL_NO_NULLS, and SQL_NULLABLE_UNKNOWN to the ConstantsDDBC enum in mssql_python/constants.py to support the new functionality.