Method arg_parser

tests/BS_thread_pool_test.cpp:3874–3874

* @brief Convert the command line arguments passed to the `main()` function into an `std::vector`. * * @param argc The number of arguments. * @param argv An array containing the arguments. */

     * @param argv An array containing the arguments.
     */
    arg_parser(int argc, char* argv[]) : args(argv + 1, argv + argc), executable(argv[0]) {};

    /**
     * @brief Check if a specific command line argument has been passed to the program. If no arguments were passed, use the default value instead.