chore(DX): Add `rustfmt.toml

rustfmt.toml

@@ -0,0 +1,22 @@
+unstable_features = true
+version = "Two"
+
+blank_lines_upper_bound = 2
+combine_control_expr = false
+wrap_comments = true
+condense_wildcard_suffixes = true
+edition = "2021"
+enum_discrim_align_threshold = 20
+force_multiline_blocks = true
+format_code_in_doc_comments = true
+format_generated_files = false
+format_macro_matchers = true
+format_strings = true
+imports_layout = "HorizontalVertical"
+newline_style = "Unix"
+normalize_comments = true
+reorder_impl_items = true
+group_imports = "StdExternalCrate"
+single_line_let_else_max_width = 0
+struct_field_align_threshold = 20
+use_try_shorthand = true