Update auto-release CI

[wemeetagain]

Is your feature request related to a problem? Please describe.

We'd like to streamline our release process to avoid manual bumping of versions and publishing.

Describe the solution you'd like

• See the setup in https://github.com/chainsafe/filsnap They use the google release-please bot to build "Release" PRs which, when merged, trigger the release process. Unpublished PRs get auto-added to the release PR, and changelogs / github releases are autogenerated from the PR titles.

Describe alternatives you've considered

• The setup that we currently have: manually bump versions in package.jsons, CI detects changes and publishes a new release.

• The libp2p setup: After every PR merged, a bot bumps the version and commits to master and publishes a new release.