This function exposes the `isConfigParameterSet` function from the C++ codebase to the Rust by using the CXX function.
This function will be used in the next D6253 diff to retrieve the boolean status if the config file flag.
Linear task: [[ https://linear.app/comm/issue/ENG-2642/disabling-authentication-mechanism-by-the-config-flag-in-tunnelbroker | ENG-2642 ]]