Add Rust code formatting tool

[yanglbme]

We need to add a GitHub Action to check or format Rust code.

[xzhseh]

I'll take over this if I have time. If anyone else would like to contribute, also welcome.

[yanglbme]

I'll take over the issue :)

[xzhseh]

I'll take over the issue :)

Thanks, I'm pretty busy these days :(