style: add rustfmt.toml

Author: EdJoPaTo

.github/workflows/rust.yml

@@ -9,7 +9,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: dtolnay/rust-toolchain@stable
+      - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
       - uses: actions/checkout@v4

rustfmt.toml

@@ -0,0 +1,8 @@
+# https://github.com/rust-lang/rustfmt/blob/master/Configurations.md
+format_code_in_doc_comments=true
+format_macro_matchers=true
+group_imports="StdExternalCrate"
+imports_granularity="Module"
+normalize_doc_attributes=true
+reorder_impl_items=true
+use_field_init_shorthand=true