Add rust fmt and toolchain files

Author: torymur

.pre-commit-config.yaml

@@ -39,7 +39,7 @@ repos:
     - id: cargo-fmt
       name: cargo-fmt
       description: Format files with cargo fmt.
-      entry: cargo fmt
+      entry: cargo +nightly fmt
       language: system
       types: [rust]
       args: ["--"]

rust-toolchain

@@ -0,0 +1 @@
+stable

rustfmt.toml

@@ -0,0 +1,4 @@
+group_imports = "StdExternalCrate"
+imports_granularity = "Module"
+reorder_impl_items = true
+reorder_imports = true