Automate release via `release-plz`

[LesnyRumcajs]

Issue summary

Right now we have a pretty manual process of publishing a new release:

1. We make a PR ourselves for the release changes.
2. Once merged, we need to click in the UI to create a release.
3. Then a housemade script is invoked to tackle with dependencies (perhaps not in an optimal way)
4. Any issues might need to be manually fixed.

This could be made easier via https://release-plz.dev/ as introduced in another repository with multiple packages via ChainSafe/rust-f3#33

Other information and links