feat: upgrades (#26)

- Add rustfmt file
- Add .cargo file for fast compiles
- use just commands and cleanup release workflows

rustfmt.toml

@@ -0,0 +1,10 @@
+use_field_init_shorthand = true
+newline_style = "Unix"
+
+# The following lines may be uncommented on nightly Rust.
+# Once these features have stabilized, they should be added to the always-enabled options above.
+# unstable_features = true
+# imports_granularity = "Crate"
+# wrap_comments = true
+# comment_width = 100
+# normalize_comments = true