Error handling routine consistency:

• Replace all instances of WT_RET with a new function that does something similar to:
  check_success(int errorcode, _LINE_) and aborts the test program in case of an error.

Configuration parser:

• Update the configuration_settings.h to return a std::optional instead of return an error code and passing a pointer, effectively converting from C style to C++ style.

Main function of poc.cxx:

• Return error code instead of exception when parsing args

random_generator class:

• random_generator should delete copy constructor and = operator