[C++] SQLAllocConnect & SQLFreeConnect implementation

[alinaliBQ]

Describe the enhancement requested

• implement SQLAllocConnect & SQLFreeConnect

• implement SQLAllocHandle and SQLFreeHandle to call SQLAllocConnect & SQLFreeConnect for conn option

• Parent issue: [C++] Implement ODBC driver "wrapper" using FlightSQL #30622

Component(s)

FlightRPC

[github-actions]

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[alinaliBQ]

implemented in #47759