✨️ Resolve "Add proost program (CLI)" ‼️✨️

Closes #5

🦀️🍰️🦀️🍰️🦀️🍰️🦀️🍰️
Approved-by: loutr <loutr@crans.org>
Approved-by: v-lafeychine <vincent.lafeychine@proton.me>

🦀️🍰️🦀️🍰️🦀️🍰️🦀️🍰️
* fix(proost): iterates over arguments as shared immutable references as to prevent cloning

* chore(proost): Add spaces

* feat(proost): Add banner support for CLI

* feat(proost): Add command line argument support with clap

* feat(proost): Add basic CLI and file handling