feat: use .rustfmt.toml for formatting options

[obycode]

We previously did this with the cargo fmt-stacks command because these config options were not supported in .rustfmt.toml, but they are now supported by the nightly build. Using this directly is better than the alias because we do not need to remember to run the alias.

[obycode]

Ah, right. This will also need a change in the rust format CI action...

[obycode]

This may need a change in the actions repo. I will come back to it later.

[wileyj]

Ah, right. This will also need a change in the rust format CI action...

https://github.com/stacks-network/actions/blob/main/rustfmt/action.yml

we created this composite because of the alias - i wonder if we can either fork the public workflow, or simply use the public one again

[obycode]

Any way we can enforce "nightly" here?

[obycode]

Any way we can enforce "nightly" here?

I don't see a way to force nightly for fmt only.

[obycode]

My latest commit puts fmt-stacks back for now, since there doesn't seem to be a way to force cargo fmt to use the nightly version. Let's revisit removing fmt-stacks once those options are supported in the stable release.

[wileyj]

lgtm