🦀 rust proj init setup & ci

provide the basic setup for rust project

github actions
- checks (fmt, clippy, test, coverage, typos with nightly and beta versions, mutil-os)
- coverage (codecov)
rustfmt config
toolchain
cargo makefile with dev as entrypoint
main.rs is just for test all the workflows, could be removed when import to the other project
When init a new project:
```
git remote add conf https://github.com/ben1009/init-conf.git
git fetch conf
git merge --allow-unrelated-histories conf/master
```
By using this strategy the history of the repo is included in the new repo, and future updates can be merged later.