Investigate the usage of Rust bindings for whisper

[afonsojramos]

As this project was born out of a shell script, most of what it does is present a pretty UI while the backend runs shell commands.

This is not ideal, but it is a working solution.

A good way forward would be to use a Rust binding so that we wouldn't need to do so much work locally: https://github.com/tazz4843/whisper-rs

Keep in mind that an important feature is that the text file is saved next to the media file it received so it will still need access to the file's path.