Add rustfmt.toml for explicit styling (#348)

* Propose an explicit .rustfnt.toml
Use 2024 style, 4 spaces for tabs and epand the default width a tad

* Auto-format the existing code with new rules

input-capture/src/windows.rs

@@ -5,7 +5,7 @@ use futures::Stream;
 use std::pin::Pin;
 
 use std::task::ready;
-use tokio::sync::mpsc::{channel, Receiver};
+use tokio::sync::mpsc::{Receiver, channel};
 
 use super::{Capture, CaptureError, CaptureEvent, Position};