Prompts the user to pick a file interactively from the current directory.
# Arguments
* `label` - A string slice that holds the prompt label to display to the user.
# Returns
* `std::io::Result<PathBuf>` - Returns the `PathBuf` of the selected file.
# Examples
```rust
fn main() {
use crate::file_picker::file_picker;
let file_path = file_picker("Select a file:").expect("Failed to pick a file");
println!("You selected the file: {:?}", file_path);
}
```