* introduce rustfmt
* Cargofmt on all sea-orm crates & examples
* Revert testing script
* cargo fmt --manifest-path sea-orm-rocket/Cargo.toml --all
* add a script for formatting
* add nightly component for formatting
* set timeout and manual nightly install in github action
* add flag for manifest-path
Co-authored-by: Billy Chan <ccw.billy.123@gmail.com>