chore(rustfmt): add .rustfmt.toml and use `nighly on fmt CI step

Author: oleonardolima

.github/workflows/cont_integration.yml

@@ -73,10 +73,10 @@ jobs:
       - name: Install Rust Toolchain
         uses: dtolnay/rust-toolchain@v1
         with:
-            toolchain: stable
+            toolchain: nightly
             components: rustfmt
       - name: Check fmt
-        run: cargo fmt --all -- --config format_code_in_doc_comments=true,wrap_comments=true --check
+        run: cargo fmt --all --check
 
   clippy:
     name: Rust Clippy

.rustfmt.toml

@@ -0,0 +1,2 @@
+format_code_in_doc_comments=true
+wrap_comments=true