task: use https://git-cliff.org for changelog (#4907)

### What
Initial effort at automating the task of updating CHANGELOG when doing
releases.

This initial PR sets up the tool https://git-cliff.org/ and adds our
missing updates since 4.2.0

The tool should be explored further, we could have the CHANGELOG linking
linear issues, not just github issues, as well as ideally each commit
displayed with it's short sha. However, rather than not having anything
like this for the last 20+ releases, this will at least have our
conventional commits be included in the CHANGELOG file.