Use Github actions for releases

[mre]

This setup will build wheels for all supported platforms.
It will publish a new version on PyPi and push the package to crates.io
when we create a new tag.
With this, we also move from Pipenv to poetry, which
provides a similar config file like cargo to manage dependencies.

[mre]

@konstin and @packysauce, can you take a look at the changes here?
Would like to move to this pipeline so that we can support more release targets and use maturin for publishing.

[konstin]

• 👍 For switching to poetry
• It looks like cargo fmt and cargo lint should only run for one python version

I've never used github actions, but in otherwise this looks good to me.

[mre]

Thanks for the support @konstin.