Automation: Fully featured release process

[wokalski]

I would like to integrate node-draft-releaser and release-drafter to create a nice package release system. It's arguable how to handle monorepos like this. I believe we should be tracking releases for all 3 packages separately and ultimately add changelog entries to given package's release draft based on changes in a commit. I.e. if a commit changes nars and nars-common, both packages should have that commit in release notes. Realistically users will only be interested in the nars package.