Add support for Arch-based Linux distributions

[crt26]

Summary

To improve the portability and the range of compatible devices, support for Arch-based Linux distributions needs to be added. Currently, the setup scripts and dependency instructions are tailored towards Debian-based systems, which may cause issues or require manual intervention on Arch systems.

Task Details

• Add Arch-based system detection to setup.sh and support pacman for package installation.
• Map required packages to their Arch equivalents where names differ.
• Handle system-specific differences in the install logic.
• Update documentation with Arch-specific setup instructions.
• Verify compatibility with virtual environments and the Liboqs/OQS-Provider build process.
• Test installation on a clean Arch-based system