Use indentation settings in dx fmt and vscode extension

Adds the ability to specify an indent string to public autofmt methods - either
a sequence of spaces or a tab character.

Get the indentation style and size from rustfmt for dx fmt, or from the editor
settings for the vscode extension.

Closes #1595

packages/autofmt/tests/samples.rs

@@ -12,7 +12,7 @@ macro_rules! twoway {
             #[test]
             fn $name() {
                 let src = include_str!(concat!("./samples/", stringify!($name), ".rsx"));
-                let formatted = dioxus_autofmt::fmt_file(src);
+                let formatted = dioxus_autofmt::fmt_file(src, Default::default());
                 let out = dioxus_autofmt::apply_formats(src, formatted);
                 // normalize line endings
                 let out = out.replace("\r", "");