Support formatting for invalid sway code

[sdankel]

Currently, if the code fails to build, the formatter will do nothing. Ideally, the formatter would still do basic formatting even when the code doesn't compile. For example, when there is a misspelled variable name but everything else is correct, it should still be able to format the document.

Here are the cases when cargo fmt does not run: https://github.com/rust-lang/rustfmt#limitations

We should aim for this as well.

[eureka-cpu]

Is this still open?

[xunilrj]

I think this is already supported. See https://github.com/FuelLabs/sway/issues/4911. But this needs to dealt on a case-by-case basis.

[sdankel]

It's still not yet supported in the formatter, but it sounds like it's not blocked.