He's into release tooling stuff and his work is going into this repo.

This adds in a release notes composer that's based on
controller-runtime's `hack/release/` tooling & the subsequent
cluster-api release tooling written by vincepri, whence it draws pretty
heavily.

This adds an actions verifier framework that makes it easy to run
various checks against a pull request title/description, and send rich
checks API results to GitHub.

This adds a github action that verifies PR titles according to the
release notes rules, and verifies a couple of basic PR descriptiveness
checks.  It's automatically run on this repository.