Cleaned up imports a bit and added rustfmt.toml

rustfmt.toml

@@ -0,0 +1,10 @@
+tab_spaces=2
+edition = "2021"
+reorder_imports = true
+imports_granularity = "Crate"
+group_imports = "StdExternalCrate"
+reorder_modules = true
+merge_derives = true
+use_field_init_shorthand = true
+format_macro_matchers = true
+format_macro_bodies = true