Organize imports by adding rustfmt.toml

[Farhad-Shabani]

Background

Related to discussion here, I stumbled upon a nightly rust fmt option that allows to configure imports grouping and granularity. Therefore, should be able to keep imports organized effortlessly.

To match rust analyzer formatter with the command run by CI, We also can add the below line to the VS Code’s settings.json:

"rust-analyzer.rustfmt.extraArgs": ["+nightly"]