Add rust-toolchain.toml and rustfmt.toml

Author: yukibtc

rust/rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.82.0"

rust/rustfmt.toml

@@ -0,0 +1,9 @@
+tab_spaces = 4
+newline_style = "Auto"
+reorder_imports = true
+reorder_modules = true
+reorder_impl_items = false
+indent_style = "Block"
+normalize_comments = false
+imports_granularity = "Module"
+group_imports = "StdExternalCrate"