How about adding rayon and multithreading where are these needs?

[Jerrody]

For example:

pub async fn get_files_in_directory(dir: &Path) -> Result<Vec<String>, String>

It iterates over the path and it's not so much damage to the performance, but if we have 1000 files and so on? And in this case would be pretty good if we had rayon.

[kimlimjustin]

I'm not really familiar with rayon but any PR will be appreciated