Add short arguments for `openmc config` options

[ahnaf-tahmid-chowdhury]

This PR introduces short command-line arguments for the openmc config subcommand, enhancing usability and convenience.

The following short arguments have been added:

• -p for --prefix
• -i for --include-dir
• -l for --lib-dir
• -c for --cmake-dir
• -L for --libs
• -e for --extra-libs
• -d for --extra-lib-dir

These changes were implemented by modifying src/config.cpp to update the print_config_usage function and the argument parsing logic within openmc_config_main.

[ahnaf-tahmid-chowdhury]

This PR depends on PR #3339