fmt: Add rust fmt toml

for standard rust fmt use

Signed-off-by: jokemanfire <[email protected]>

Author: jokemanfire

rustfmt.toml

@@ -0,0 +1,4 @@
+newline_style = "Unix"
+unstable_features = true # Cargo fmt now needs to be called with `cargo +nightly fmt`
+group_imports = "StdExternalCrate" # Create 3 groups: std, external crates, and self.
+imports_granularity = "Crate" # Merge imports from the same crate into a single use statement