Shutdown on Inactivity

[kulak]

This is more of a review request. I am new to RUST, tokio and Axum and this type of code is challenging to write.

So, I built an inactivity shutdown middleware, but I'd like to get a feedback if it is done right. It works, but I might be unaware of something.

Here is github project: https://github.com/kulak/axum-middleware/